What is a sub domain?
www.domain.com is a domain name.  A sub domain is anything that replaces the www in a domain name. forum.domain.com is a subdomain. www.forum.domain.com is not a sub domain
Sub Domain Setup 
To create a sub domain cPanel asks for the name you wish to use. MAKE SURE the sub domain name you give […]

You cannot create an addon domain if your dns for the site you are trying to add hasn’t prorogated yet.
To create an addon domain login to your cpanel and click “addon domains” There are three fields cPanel asks for when creating an addon domain.
1. “New Domain Name:” You will put in the newdomain.com do not […]

Make sure your user name and password is all lowercase.
Make sure you have created the email address in your control panel.
Change the user name to the full email address. Example: username@domainname.com
Still not working?
Change your incoming and outgoing mail servers from mail.yourdomain.com to the ip address listed in your welcome email.
Are you able to receive emails […]

To create an email account login to your control panel and click add/remove email account’s. *NOTE: By default you have no email address setup. The main username may look like it’s a setup email, but if you wish to use it you will need to add it as an email account.

It generally takes between 12 to 48 hours for your DNS to Propagate and point to your domain name. During this time you can still view and edit your website. Click on “FAQ” or “Account Setup” under Categories and there are some tutorials on how to do this.
We do not recommend installing scripts […]