Problem enabling basic caching in Wordfence

I’m a noobie. I enabled basic caching and got the error warning to manually remove the caching code in the .htaccess file. I searched for similar issues and most were over a year old, so I don’t know if this was a bug that has since been fixed, but I read that I should not use caching since I have an SSL site, so I disabled it and got this warning again. I don’t know how to remove this code, from which .htaccess file, and have no idea what the caching code looks like.(I have 3 .htaccess files, one for backupWP, one for wordfence lib, and the other for wordfence tmp)

Any suggestions?