To set up your email client (Outlook, Mac Mail etc) you will need to know your email settings of your email account. 

Fortunately these settings can be found in your cPanel.

Firstly, log into your cPanel control panel.

Go to Email -> Email Accounts

You will see your email accounts listed. If there are no email accounts listed you will need to create one.

To the right of the listed email accounts yo will see a link "Set Up Email Client"

Click the "Set Up Email Client" for the email account you wish to see the settings for.

You will then be presented with a page in cPanel listing your email account settings, which will include your username, password, incoming and outgoing servers, port numbers etc.