Login to cPanel account: https://cloud.readyspace.com/knowledgebase/article/22/how-to-login-to-cpanel-for-webspace-and-office-mail/
To modify an e-mail account in cPanel, follow these steps:
- In the Email section of the cPanel home screen, click Email Accounts.
- Click the setting that you want to change for the account:
- To change the account’s password, click Manage. Then type the new password into the New Password field under Security.
- To change the account’s quota, click Manage. Then allocate the storage allowed under Allocated Storage Space under Storage.
- To access the account’s webmail, click Check Email.