Vanessa, if you would like step-by-step instructions to guide you through this process, here is a link to the RAM replacement guide. Hope that this helps!
To remove the keyboard, remove the two screws that are closest to the power button and power adapter port on the bottom of the device, where the dock port is located. Open up the device, and you will be able to lift up the keyboard from the top near the F1-F12 keys. You'll need to disconnect the long, black ribbon cable by gently lifting on the black plastic ribbon cable clamp. Be careful, they're easy to break! To install a new keyboard, you can follow these steps in reverse.