WHM stands for Web Host Manager. This is the cPanel's server administrative management software.
The WHM panel is accessible only for customers with a dedicated solution, since they have a root access to the corresponding server.
If your account is located on one of these solutions you can access the WHM panel using:
http://yourdomain.com/whm
Please have in mind that you need to replace "yourdomain.com" with your actual domain name, pointed to the dedicated solution.
In a case your domain is not pointed to the dedicated solution, you can access the WHM panel using the server's IP address. It can be found in your Customer Area->My Account section->Manage->Your IP address.
The WHM panel is accessible only from locations listed in the firewall installed on the server. If your IP address is not listed in the firewall rules, you should contact the Hostlantern Technical Support Team by posting a ticket via the Help Desk, under the Port Opening Request section.
The login credentials for the WHM panel are usually:
Username: root
Password: your password
By default the password for the root user is set to the password of the cPanel.