For people to join your team, first, they'll need to create a ChangeX account by going to https://www.changex.org/ie/users/sign_up.

Once they have an account set up, you can either send them invites via the functionality under "Recruit Your Team" via email address, Facebook, or Messenger.

Or you can share a link directly to your project page and have them click on the big "Join" button at the top.