Have 2 AOL email accts & only getting mail from 1 (& it is not the one associated w/my Apple acct)

Guys, I'm 73 and totally new to cell phones and I just got the iPhone 13 Pro. I've been stumbling around trying to follow Support and somehow managed to enter only 1 of 2 AOL email accts that I have. What do I do to add the other one (Please use very, very basic directions!) Thank you for your assistance.