The following steps will show you how to block emails on AOL. You must launch your browser on your PC. You must enter www.aol.com on your browser's address bar. It will navigate to the AOL website. You must log in to your AOL account through your credentials. You must open your AOL mail account. You must click on "Options" in the upper-right corner of the web page. You must then choose "Mail Settings." You must click on "Block Senders." You must enter the email address of someone you want to block and then press Enter. You must click on "Save Settings" once you're done.