Can I add a give button to my invitation email?

To add a "Give" button to the Invitation email in Attendance, put your donation link in the Donation Website field in Event Details. That will automatically add a Give button with a link to your donation site to your invitation emails. Clicking the Give button does not count as a declined registration in FundEasy.

This article has more information about Event Details.

To add a Give button or link to other emails, use the edit link in the right corner of the template preview in Event Setup > Web & Email Templates and add the image and link to the text editor.