After you have sent an invitation to your team member, they will receive an email.
If they hadn't received an email, please ask them to check their spam/junk folder.
All they have to do is click on "Accept Invite" button.
Once they click the Accept Invite button, they will be redirected to the Serviceform Sign-up page
All they have to do is give a password and click sign up. Then, a new account is created for them and they will be assigned to the team that they were invited to.