From the xCenta Essentials dashboard, click on your Name and Location, a drop down list will appear. Click on Location Admin.
Click on the Manage Groups tab.
A new page will load. Select the group you wish to assign users to. Click on the Edit icon.
A new pop up will load. Tick the users you wish to assign to the group. Then click Submit.
Every time a change is made to a group, click 'Apply.'