Step 1: Access Your Portal Settings
Step 2: Open Global Settings
On the top right corner, click on the menu and select global settings from the drop down.
Step 3: Look For the General Settings Section and Set Your Domain.
You'll find the domain option under the general section. Click on the edit icon on the upper right hand side of the box and set your domain name. You can also set a title and google analytics tracking ID on the same section.