Login to your Centerpoint Gmail account
Click on Mail with the drop down arrow beside it in the top left hand corner of the page
Click on Contacts
Under My Contacts click on Directory
In the search bar, type in the name of the person you'd like to add to the group and click on the magnifying glass
Click on the check box next to the name of the person you'd like to add
Click on the group icon with the drop down arrow next to it (it looks like three people with three heads)
Click on Create New
Name the group and click on OK
See Below For Demo