Denise - you didn't provide *any* details so the help I can provide may be rather limited, but here goes:
You can transfer pictures to a computer a couple of different ways. The first method requires that you install any software that came with the camera on your computer and reboot. Next, connect the camera (powered off) to the computer with the included cable - which is almost always a USB type on one end and one that fits into your camera on the other. The camera will need to have working batteries, so be sure that they're good. Turn the camera on and the camera software should automatically detect the camera and start up. You should be able to transfer, possibly edit and save your pictures on the computer. If you didn't receive software with your computer, skip the software installation step above - but do the rest. Double-click the Computer icon (to show you the hard drive and DVD/CD icons) and look for a new drive. The new drive represents the camera memory. You can open the drive and work with the picture files just like they were files on a hard drive. Move, edit, copy, delete or save them as you see fit. The drawback to this method is that transfers from you camera are often slow and of course you need batteries. A second method is not limited by these - but does cost money. Keep reading.
The second method requires the use of a "card reader"
An external USB multi-format card reader.
Card readers are powered by and transfer files via the computer's USB port. They run at significantly faster speed than the camera and can be purchased for as little as $10. To use them, install software included with the reader (if any) and reboot. Connect the reader to the computer's USB port. Remove the memory card from the camera and insert it into the appropriate slot in the card reader. A message stating that a new device has been found and software is being installed will appear on the monitor. Double click the computer icon and look for a new drive icon. Double click the new drive to show the image icons on the memory card. Move, edit, copy, delete or save them as you see fit. When done click the "Safely Remove USB" icon in the System Tray and then click Remove. If you don't see this - simply remove the reader from the USB port or the memory card from the reader slot and you will be shown how to do it properly the next time.
Be sure to FORMAT the memory card after you insert it into the camera before shooting new pictures. Formatting the card on your computer is not the same - and should be done in the camera. Formatting removes ALL data from the memory card, so if you wish to leave images on the card to show others on the camera - do not format. As mentioned above, the format should be done before taking new pictures.