There are several ways that you can use to login to your WHM Control Panel.
Step 1: If you have a working domain name, you may enter the link to URL [https://domain.com/whm] with the login details available in your Welcome Email.
Step 2: If your DNS is not yet configured then you may use the Server IP Address or
Serverhostname to access [https://Serverhostname:2087] or [https://ServerIPAddress:2087]