Hi AmiYuy,
- Visit this page to create a button.
- Change the button type to donation and fill out the form
- Click 'Create Button'
- You will be given some form code, click the tab that says email (see attached image, ignore black box)
- Use the ID found at the end of the url.
Another option would be to just create your own button with bbcode. When you create your donation button in paypal just use the email url and wrap it around an image.
[ url=https://www.paypal......][ img]http://www.wowinterface.com/images/paypalSM.gif[ /img][ /url]
I'll work on updating the FAQ. Thanks for the heads up.