The Paypal address is the email account you set it up under. You will need to remember your password to access the account. Once you're in, you can set up preferrences to have Paypal automatically put a link in each one of your auctions. All a buyer has to do is go to their account, click on the send money tab and put in your email address and send the money.
It's not really that complicated.
Ask if you need to know more.