[sinisterpain]

1. When you create your button you can set the amount you wish if you leave the button at 0.00 the donor can donate what they wish for an amount. All you need to do is create more than one button for various amounts.
2. If you set up your paypal account you can add the feature to allow members to put notes. When the donation is made any notes can be viewed in the admin CP=>Donations=>valid transaction info.
3. No it does not. It uses the user's email address and their ip to grabe the data from the user table.
4. All you have to do is make sure that each button that is created is assigned to the goal. This is done through the admin cp create the goal then go to your button and assign it.

Hope that helps