To change the password for your mailbox, follow these steps:
1. log in to cPanel and find the Email Accounts icon
2. next to the email address for which you want to change the password, click Manage
3. enter or generate a new password. Make sure to copy it to a secure location. Here, you can also set a new mailbox size limit or set it to unlimited (it will function properly until the overall hosting account space is used up)
4. don’t forget to save the changes