PROBLEM with PayPal Donate Plugin for WordPress

Hello,

I’m having a very hard time configuring the options-paypaldonate.php file for the PAYPAL plugin found here:
http://ejoneclicks.com/2006/06/14/paypal-donate-plugin-for-wordpress/

Can anyone helpspecify which of the lines needs to be modified, and in what way?

Specifically I’m having a couple problems:

First, this line: $location = get_option(’siteurl’) – Where do i point it to?

Second, I get this error when I click the PayPal button which takes me to this site:
https://www.paypal.com/cgi-bin/webscr
“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.”

and Third, the PayPal button does not show up in the sidebar. I thought it was because maybe the image was HotLink protected on the paypal website. But I changed it and put it on my server and still nothing.

Any ideas?
Thanks in advance!