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You may need watchmaker tools to open it without scratching it. You'll also want to replace the gasket to keep it water resistant and you may need to use a caseback presser to put it back on. Best bet is to take it to a watch shop and let them do it correctly. Cost is about $8 at most places.
Watch makers/technicians use a special press to replace the back. You can get these presses but the cost can be more than it is worth.
Since the watch is most likely water resistant and you will have to go to a watch maker/technician to replace the back anyway I recommend having the rear seal inspected and replaced if needed and having the watch pressure tested to be sure that it is sealed to factory specifications.
You need a replacement stem and crown. I would replace the stem just to be sure you arent putting a new crown on a damaged stem.
Sakgen is very good about repairing their watches. Unfortunately this doesnt fall under their warranty but the repair directly through them is an average price for this part.
Generic after market crowns are also available at local watch repair shops. Make sure that if you go this route that you select a shop that can reseal the watch to is water resistance rating so you do not void your lifetime limited warranty on the movement. This mean they must have a pressure testing chamber and be able to supply printed proof of resealing.
This usually means the battery is dying. Usually the backs on these are very tight, and the back has to be taken off to replace the battery. You might be able to get the back off without damaging the watch, but you probably will not get it back on without breaking the crystal. Best thing to do is take it to a reputable watch repair place or jewelry shop and have them replace the battery for you. Before they begin, make sure they are willing to replace the crystal for free for you if they break it!
Try AWCI.com for someone in your area. I recommend a good watchmaker even for a cell replacement, they will usually clean the case and band, do a consumption check, a min run voltage test and a water resistance test and new seals to keep watch fresh.
The crown or winder, should have a very small o ring inside it, which seals on the watch case. Normally when replacing the stem this o ring would be replaced and lubricated with silicone grease to ensure water tightness. If this was not done there is no guarantee that it will still be waterproof (please dont forget to rate my answer, thanks)
when you look at the back are there three small rectangular indents evenly spaced on the edge on the back? If so you'll need a special tool for opening waterproof watches. the tool adjusts to fit the three indents then press down as you turn counterclockwise. you can find the tool on amazon.com or your local jewelry store. make sure the gasket is in place and not damaged before screwing the back on.
here is a link to the tool http://www.amazon.com/Pavilion-Professional-Waterproof-Adjustments-Caseback/dp/B000K3SK0Y
This is to let you know that the battery needs to be replaced.make sure that you use a watchmaker that can test and replace any worn case parts so that your watch will retain it's original design water resistance.