Twine does not charge per member, so you can add as many teammates to your workspace as you'd like at no additional cost. To add Members:
Click your Workspace name in the lower left corner.
Click Members in the navigation menu.
Click the Add member button in the upper right.
Enter the email address.
Click the Invite button in the bottom right.
To deactivate a member, click the ... to the right of their name, then click Deactivate. Use the filter menu at the top of the page to filter based on Active, Pending, and/or Deactivated members.