When you already know your existing password for AOL then with the following steps, you can change your password:
Step 1: You have to open a browser and then go to AOL.com
Step 2: At the top-right of the web page you will see your profile picture. Just click on it.
Step 3: In the navigation pane you will see ‘Account Security’ on the left. Again click on it.
Step 4: Then click on the “Change Password” option
Step 5: Insert new password as per instruction and click on “Continue”
In this way, you can change the AOL mail password.

For more read - https://mayiassist.net/fix-aol-mail-login-issues/