1. Open http://example.com/webmail, replace example.com with your domain name.
2. Enter your full email address and email account password and then press the blue Login Button.
3. You will be redirected to a cPanel Webmail Page. You have three clients availabe to you - Horde, Roundcube or SquirrelMail. Select which works best for you.
If you wish to switch between Webmail portals, look in the top right hand corner of your screen for a blue button that contains your email address (it appears next to the gray logout button). Click once to expand. You will be presented with the option to switch Webmail interfaces!