To add a contact to a Group, follow the steps to Add/Edit/Delete a contact page. 

Once you have opened the Edit Contact page, click Add Group and select the Group from the list.

Don't see a group? Maybe you haven't added one yet.

If you click on Groups (and you don't have any groups created yet), a pop-up will appear.

Select Yes. Next, create a group. Type in the title of the group.

Under "Add Contact" type in the email addresses you want to add to the group (separated by comma) and select Add.

Once you are finished adding contacts, select Save.

To create a new group from the Groups section, select the Add  icon and follow the same steps as above for creating a new group.