You can add a person to a group using the Group Settings screen. The Group Setting option can be found in the upper-right corner of the group. Switching to the People tab will display all the users in the group with the ability to add or remove a person.
You can add a person to the group by clicking or tapping the Add Person option. Select the person from the list and click the Add option.
Adding a User to the Group:
Step 1. Click or tap the Group Settings option.
Group Setting option.
Step 2. Click or tap the Person tab.
Step 3. Click or tap the Add Person option.
Add Person option.
Step 4. If necessary, use the filter or search to locate the person you want to add to the group.
Step 5. Select the person, and click the Add option (located in the bottom-right corner on the web app) or tap the Send option (located in the upper-right corner on mobile).
Step 6. Repeat steps 4 and 5 for as many users as needed.