I'm not sure where I would have to go to change it, but it might just be easier to start all over again and replace the existing PayPal button with new coding altogether. I may have to wait until January to experiment...life is just overwhelmingly hectic right now with no big block of free time available until after New Year's Day (I'm here right now compliments of a few precious spare moments between blood tests & grocery shopping and preparing supper for my brother.)
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When you don't like a thing, change it.
If you can't change it, change the way you think about it.

(Maya Angelou)