Sometimes new Members need to be added into an already created group so we created an easy way to achieve that!
Here's the steps:
First you'll want to navigate to the Membership of one of the Group members
Then you'll want to scroll down until you see the 'Group info' button, you'll want to click on that
Then you can click 'Add Group Member'
There you can add the new Members information to be added as a member in that group.
Here's a screenshot of the 'Add group Member' button: