aol

You may need to add your AOL mail account to the Mail App on your iMac. If you have never adding an e-mail account, please refer to:

https://support.apple.com/guide/mail/add-or-remove-email-accounts-mail35803/mac#:~:text=Add%20an%20email%20account&text=In%20Mail%2C%20choose%20Mail%20%3E%20Add,use%20that%20account%20with%20Mail. for instructions.

If you need additional help, I would recommend calling AppleCare and they can help walk you through the process. If you are in the USA the number is 800-275-2273, however outside the USA you can click the following link to locate the number for your part of the planet. AppleCare contact Information