- login to cpanel using email account and password
- list will appear to you ,choose services
- list of services will appear to you,choose the service you want to control
- list of actions will appear,choose login to cpanel
- list of emails will appear to you,choose Email Accounts
- Choose the email you want to change it's storage space,as in the following image
- enter the space to be changed in a field(allocated storage space) or In case you wish the email space to be unlimited choose (unlimited)
- After that click on (update email setting), as the following image
