1. If you're adding another email account to Mail, from your inbox, click the Settings (gear) icon at the bottom middle, then click on Manage Accounts, then click Add Account
  2. If you're launching Mail for the first time, or after following the above steps, select POP/IMAP from the list of options
  3. Enter your email address, the name you'd like to use when sending emails, and your password
  4. Wait a couple seconds for Mail to detect server settings, then your emails will start downloading and you'll be done!