You can invite up to four(4) other users using this form.

You can invite as many other users as you would like by using this form as many times as you need to. The users have 72 hours to activate their invitation. If the user does not respond, you can always send another invite as well. All of your invites are tracked here, on your Invite Status Report. Also, a copy of these invites will be sent to your email at (your email address).