Thanks for reaching out to Jotform Support. Unfortunately, adding team members to Jotform team is only available for Enterprise Users. Note that our standard plans (Starter, Bronze, Silver, and Gold) are individual, single-user plans. If you need to collaborate with others, consider sharing your forms and your table's collaborator link. This can be accessed by clicking on the Share your Table or Collaborate Forms at the top right corner of your table and form builder. Let me show you how to collaborate your forms with others:
On the top-right side of the Form Builder page, click on Add Collaborators.
In the window that pops up, click on Copy Link and then just share that link with your teammates.