Login to cPanel then click on the Email Accounts icon link:
➜ then click +CREATE
➜ then enter your email username
➜ enter a password
➜ set the Storage Space quota you want for the account
➜ then click +CREATE
Once the email is created you can then setup the account on your PC and mobile devices.
To get the settings of the email account click the CONNECT DEVICES button on the Email Accounts page. Use the SSL settings for secure IMAP email.
Or check and send email using webmail, click the CHECK EMAIL button on the Email Accounts page or login to webmail directly using your email and password via, eg. https://mydomain.com.au/webmail