To create your e-mail boxes you will have to do this in your cPanel account with the E-mail option.
Where can I find my cPanel accesses?
Once the box is set up, you can configure it using the information you will find on the same page>> to the left of your mailbox> click on the “More” button> then on “Configure the mail client “. All the information you need to set up your email client can be found on this page