Looking at the AOL instructions, I would then generate the App password (via their website) after you enable 2 step verification, and then manually all your mail account in eM Client via using the “Add Other” option.
Click Menu / Tools / Accounts.
Click the Add New Account (+) icon.
Click Mail to expand options and click Other.
You will then need to manually enter your AOL IMAP or POP details with your AOL account name and “App password” you setup.
(AOL IMAP & POP account settings)
https://help.aol.com/articles/how-do-i-use-other-email-applications-to-send-and-receive-my-aol-mail
(AOL / Verizon IMAP & POP settings)