Help with Mail Chimp

I work part-time for a not-for-profit. We have a website and will be adding a newsletter to the website using MailChimp. I have already created the newsletter in MailChimp. There is one section of the newsletter that has a donate button. I used the button in MailChimp but cannot for the life of me figure out how to link the button to our PayPall account. I also went to our PayPal account and tried creating the button there and copy and paste the code to the newsletter. But, again I had problems and it just didn't work.

Any assistance is appreciated. Thanks.