POP Account:

Usually you will enter "postmaster" into this box. postmaster is the "master" controller of your email domain. Login as "postmaster" when you want to set up new accounts, etc.

You can also enter an individual POP3 username into this box and access a limited control panel where you can change the current users password and set other options.

Password:

Enter the password you have assigned for this account. By default, this is set to the same password as your control panel.

Domain:

Enter your domain name in this box. Do not enter a leading "www", http, etc.

For example, if your website is http://www.mydomain.com/ just enter "mydomain.com" into the box (without the quotes).

If you do not have a domain name, enter: your_username.phpwebhosting.com