To log in to the WHM in Hostgator, follow these steps.
Using the server name
If you know the server name, go to https://ServerName:2087 to access WHM.
Using the server IP address
If you know the server IP address, go to https://YourSitesIPAddress:2087.
If you are facing any problems in connection to the WHM using the above given URLs, chances are that there might be some blocks to the port ‘2087’ either by your ISP or antivirus. Check it to diagnose the issue.
Here is a detailed video showing the steps to log into the WHM (credits: hostgator)