If you use our DNS servers (which we highly recommend), then the incoming and outgoing mail server will be mail.<yourdomain.com>, so if your domain is myamazingdog.com, then your incoming and outgoing mail server would have to be mail.myamazingdog.com.
The username will always be your email address you're trying to access e.g. email@example.com and the password will be whatever you defined during the creation of the mail-account in our email interface.
You can also click the "Connect Devices" icon next to the email:
On the page you arrive at, you'll see the Secure SSL/TLS Settings (Recommended), which will list incoming and outgoing server as well as the ports used - for outgoing port over SSL/TLS you can also use port 587.
If you forget your password to your email, we have no way of recovering it, you can, however, change it within the "Email Accounts" menu item in cPanel.
You can do this by clicking the "Manage" icon, from here you'll be able to set a new password.