You can add and invite staff to a team all from within the App.
Open the App
Make sure you are in a team and a team admin
Tap the menu icon at the top left of the screen
Tap 'Members'
Tap 'Add' at the top right of the screen
Add or invite a staff member
Select a team member from the list if they are already in the company
Or type the email of a new team member to invite them
Once selected all the people you want to add/invite, tap 'Add' at the top right
