Please download bug fixes regularly by going to System -> Updates, then click Install Update (For your current version). Alternatively, activate Automatic Bug Fixes in System Settings.
Make sure you have set up Cron in your control panel to run at least once a day. This is very important and required for automation.
The first thing you need to do is login to your WHM and generate an API token.
Search for "api" to quickly locate the API tokens link
Generate a new token
Give your new token a name, scroll down and save
Save your API token somewhere in your computer. You won't be able to retrieve it from WHM later.
Login to your Hosting Billing admin area, click on Servers, Add Server, and fill in the details with your server details as shown below: