[Worried Me]

I have purchased a Kindle Global and like it very much. When charging the battery I don't know what the message on the screen that says " If you want to use your Kindle and continue charging please eject from your computer. " It also tells you [ when you read the Kindle info on the machine itself ] also to eject after you have finished from the section on your computer where the Kindle file is . I am not very computer literate and don't understand what this
' eject " means . On my PC where the Kindle shows up it only has Audible ,Documents and Music. I can't see anything there that allows you to do anything and can't find the Kindle anywhere else on my PC . I am worried that I am doing the wrong thing by just pulling the plug when I finish charging . I am running XP. Thanks for any help.