Finally an answer that works! Thank you very much, Sophia.
It took awhile to find the Abandoned Cart email template, so just keep clicking around and you should find it. To make the address change, begin Editing the Abandoned Cart template. Scroll to the bottom find the address on the left. It would not let me edit it, so this was my workaround. Uncheck the Address box on the right side. Then click Done in the upper right to save it. Then Edit the template again, and scroll down and select the Address box on the right side. This DID NOT CHANGE it to my new address, but it allowed me to edit the address myself. Click on the wrong address on the left and change it. Then click Done in the upper right.