Within Teamwork, you can invite a new user to your site using the Teamwork Android app.
To add a new user tap on the menu icon (three lines) on the top left of your screen, then go to People towards the bottom of the menu.
In the People section, you will see a list of the users on your site. From here, click the
+symbol near the top right of the screen.
A prompt will appear for you to choose the account type of the new user.
Once you have selected the account type, you can then fill out the user details such as name, email, company etc.
Scrolling down you will also see where you can set the new user’s permissions and preferences.
Once you click Save, the new user will automatically populate into your user list.
For more information, see: Adding a Project in the Teamwork Android App