I am not from tech support, but I believe I can help you. Are you trying to set up a program like outlook? Or are you trying to get access to your email from any computer?
For webmail, just type in
www.yourdomain.com/webmailYou will be taken to your log in where you type in your email address and password for the email you want to access.
For email programs such as outlook or Thunderbird, you will need to access your options, and add a new account. your username is the full email address, for example yourname@yourdomain.com. Your ingoing and outgoing servers are mail.yourdomain.com.
I hope this helps you.