You can find this in WHM under Account Functions.
If your resold client is suspended, you can unsuspend them in WHM. Click Suspend/Unsuspend Accounts in the left menu, highlight the domain, and click unsuspend. If you cannot, then there is a security ticket that must be resolved first; please contact our Support Department for assistance.
Note: You're able to customize your company's suspended page - this will be the page your customers will see if you suspend their account. To edit it, please follow these steps: Step 1: Log into WHM
Step 2: Click on Modify Suspended Account Page
Step 3: Modify the HTML code and click Save. | 
