In order to enable GD Support in your WHM/CPanel VPS you need to complete the following steps:
- Login to WHM as root
- Go to Software -> EasyApache
- If prompted to upgrade, do so then repeat step 2
- Begin customizing based on the current provile
- Proceed through the screens until you get to "Step 5"
- On "Step 5," click on "Exhaustive Options"
- Under PHP, check the checkbox for GD
- Proceed with Build & Compile Process
- Make sure you wait for the build to complete.