You can invite other users to join your account on Rightster using the ‘Add To Your Team’ link.  This is a unique URL which sends your contact to the registration page and locks their company field to your account name.

You can find the ‘Add To Your Team’ link by clicking on your account avatar on the side menu:

Should you decide against the invitation click ‘Reset Link’, shown as number 1 in the screen grab, to generate a new URL, removing access to those attempting to register through previous invites.