- Log into WHM.
- Click Account Functions > Upgrade/Downgrade an Account.
- Select the domain to which you would like to make changes and click Modify.
- Select the package to which you'd like the domain to be upgraded and clickUpgrade/Downgrade.
Still having the problem? cPanel doesn't recognize the update immediately. To expedite the process:
- Log into WHM.
- Click Account Functions > Limit Bandwidth.
- Enter new bandwidth. Give the site 1 MB of additional bandwidth. Click Limit.
- Refresh the site in your browser.