Step 1: Open the group that you would like to add a member to.
Step 2: Navigate to "Directory" > "My Organization".
Step 3: Click on "Groups" at the top, then locate your desired group in the groups list.
Step 4: Click "Edit" in the upper-right corner.
Step 5: Go to the "Members" tab and click "Add Member".
Step 6: Search for the user you want to add and select them to include them in the group.
Step 7: Once you've added all desired members, click "Save" to confirm your changes.