The front lens will not close - Sony Cyber-shot DSC-S600 Digital Camera

That would depend on the camera, but I'm going to assume you have one with interchangeable lenses.

The camera manufacturer probably makes one or more "macro" or "close-up" lenses for your camera. Any of these lenses will let you get closer than a normal lens. Many third-party lens makers also make macro lenses.

Another alternative is to put extension tubes between the lens and the camera body. This moves the lens further from the camera, shortening the focus distance.

Probably the cheapest (and lowest quality) alternative is to put close-up lenses on the front of any lenses you already own. These screw on to the front of the lens like a filter and act like a magnifying lens, letting you get closer to the subject.

The ring threads onto the front of any lens with a 49mm filter thread, just like a filter. The front of the lens then fits onto a camera body, effectively mounting the lens "backwards" or reversed. With most lenses, this allows the lens to focus very close, for close-up or "macro" photography.

This is a fixed lens camera so the short answer is no. However there are third party accessories lenses that can be screwed to the front of the lens to give a "fish eye" or telephoto capability. To get "Macro" there is a kit available which has a series of three close up lenses these lenses screw to the front lens element of your camera allowing for some pretty impressive macro capabilities.

Again to answer your original question no you can't change the lens on your camera

Close up and macro photography require special lenses chances are you are to close for the lens to see what you are attempting to focus on. Another thing if you are hand holding the camera the chances are extremely good you can't hold it steady enough for the camera to lock on to the subject.
When shooting macro the depth of field is extremely shallow to you need to stop down the lens to maybe F11 or even F22 so now you have a light problem. You didn't say how close the subject was to the front of the lens. So to get started on this close up photograph mount the camera to a tripod switch the lens to manual and slowly focus on your subject. There is a small green dot in the lower right corner of the viewfinder that will come on sold green when your subject is in focus. If it doesn't you are to close to the subject for the lens you are using.

Lens errors are fairly common. Usually it's sand or grit interfering with the lens extension mechanism (look closely for sand particles around the lens barrel of your camera. A single grain of sand can jam in the gaps around the barrel, preventing the barrel from closing. Use air or a thin sheet of paper to dislodge them). Or the camera's been dropped with the lens extended. Or the camera has been powered on, but the lens had been blocked preventing its extension. Or the battery ran down with the lens extended ... Unfortunately, many cameras that fall prey to this can only be corrected by professional repair. But, here are some things that you can do that may correct it. They only seem to work for less than 40% of the lens errors, but if the camera is out of warranty, they're worth a try.

That depends. A true macro lens allows you to get a 1:1 reproduction ratio; most manufacturers call a lens "macro" if it allows 1:4 or so. Some lenses work better for close work if you reverse them, using a reverse adaptor to put the nose of the lens onto the mount. Bellows and extension rings behind the lens will give you sharper results than close-up adaptors that screw onto the front of the lens.

The focal length will affect perspective; to get the same image size with a wide angle lens, you'll have to get closer, wihch will make the background seem smaller and farther away. You don't have to get as close with a longer lens, which will make the background seem larger and closer.

The aperture affects depth-of-field. If you're photographing something flat, like a piece of paper, you don't need much DoF. If you're photographing something three-dimensional, you'll need more DoF.

The exposure mode might depend on the lighting conditions and your personal preferences. I tend to do most of my close-up work in Manual. I also tend to focus manually, for better control.

There's no one set of "best" settings for close-up photography, any more than there's a set of "best" settings for any other type of photography.

your lens are stuck! did you drop the camera? you need to get a repair on the lens

Buy the next camera- at 3 years old no economic repair will be feasible- but you could play with it some I guess

very small dust particals are the reason of this problem.I m suggesting an idea but apply it on your own risk.Keep camera in off position then slightly strick with ur fingernale around the lens ring evenly.This can make the lens shutter contrct.Once the shutter closed,clean gently with a painting brush over the edges where shutter slides from.do this for several times so that any hard dust partical causing may removed.do not insert anything inside.

In my case, there was dust in the switches that sense the cover movement.

1. Close the sliding door and wait until the lens is drown inside (timeout).
2. Open the screws that secure the front cover.
3. Remove the sliding door covering the lens. There is no trick (hidden screws etc) so just use the force. The door is mounted by two-sided tape and adhesive.
4. Remove the front cover. This is also mounted by two-sided tape / adhesive in the center, so you have to be a bit brave.
5. The sliding door rails and the movement sensors are now visible. Clean all dirt.
6. Try the door functionality.
7. Mount the front cover after the lens works as it should. Close the screws.
   
8. Mount the sliding door.