Fundraising plugin does not connect with Paypal

Hello,

I recently installed the Fundraising plugin and are experiencing problems.

I have filled in my paypal address plus API credentials. I also registered the APP and filled in the APP-ID on the settings page. However, when I want to make a donation I get the following error from Paypal:

Return to Merchant

Error Message
We cannot process this transaction because there is a problem with the PayPal email address supplied by the seller. Please contact the seller to resolve the problem. If this payment is for an eBay listing, you can contact the seller via the "Ask Seller a Question" link on the listing page. When you have the correct email address, payment can be made at http://www.paypal.com.

If I make a re-occuring payment I get this:

Return to Merchant
Error Message
The link you have used to enter the PayPal system is invalid. Please review the link and try again.

On another note, the fundraise page now replaces my website header with the feautured picture. How do I get rid of this?

Link to page: http://carpetsforcommunities.org/fundraisers/child-friendly-school-fundraiser/

Looking forward to hearing from you.

Rowan