WHM is a web-based tool used by server administrators and resellers to manage hosting accounts on a web server. WHM is where most root level functions for the server are performed. As such, they require a user with root level access.
WHM can be accessed as:
http://Server-Hostname/whm
http://Server-IP/whm
Via WHM port:
http://Server-Hostname:2086
http://Server-IP:2086
In above examples, hostname & server IP, will be provide by hosting company e.g. KLhost