You will have to either get the password from you friend so that you can access the Blackberry Internet Services. BlackBerry Internet Service
Or you can call att and get the pin released.
If your pin is free than you should be able to go to your carrier's site (sorry I can't post links yet, google verizon blackberry email) and create a new account and enter your email info there. You can also do it directly from your BB under set up wizard or set up internet email.
If the pin is not free than you need to call whatever carrier your friend had to free it.