In the Account Manager section, click on the MySQL Management icon or type MySQL Management in the navigation filter box. The option will appear. Click on it.
Step 3 - Select Database
Under database text, click on the database you wish to modify privileges for.
Step 4 - Modify
Under the User list, you can find your database users. Click on Modify Privileges. Modify Privileges according to your needs and click the Change button.
Your database user privileges should be successfully changed.