To create an email account, login to your control panel using the details which we sent to you within yoru cPanel (ftp) email, One youar elogged into that panel, click 'Mail', then 'Add/Remove Email Accounts'.
You then need to simply complete the fields with your chosen username (such as admin, support, etc) and password.
*NOTE: By default you have no email address setup. The main username may look like it is setup as an email, but if you wish to use it, you will need to add it as an email account.