Go to File > Info > Account Settings > Server Settings. Then, click on Outgoing Mail and enter the relevant settings. You can use the same outgoing server email setting to set up your AOL email for a Mac or Windows 10 mail app, an Apple iPhone or Android mobile app, or a web browser program. The Settings link is at the top right side of the AOL Mail screen. In Settings, under General, there's a check box for "Use a reading pane to view mail." You can read mail in your inbox without opening each individual message.