How to add a POP3 account in your gmail account?

Email > Email program configuration
1. Login into your gmail account, click the "settings" button on the right of the page.
 
2. Go to the settings->Accounts and Import panel, click the "Add a pop3 mail account you own" button.
3.  Add your own email account.
4. Refer to below image to configure your own email account, then click the "Add account" button, it should be fine.