If your Participants are getting a message that your SignUp isn't ready yet, or you're not seeing the active Organizer view navigation bar (shown below), your SignUp is likely still in the Planning Wizard -- all the planning steps are not completed so the SignUp is not live yet..
SignUps still in Planning mode will show a red triangle icon on the Dashboard - Card View. When you complete all the planning steps, your SignUp will be active and ready for Participants, and the triangle will go away.
It's easy to finish the Planning steps:
Open your SignUp to the Organizer view by clicking on the SignUp Title Then, finish each of the Planning Wizard by clicking the Next button at the top of the screen until you arrive at step 4.
On the final screen, Step 4, the setup is complete -- your SignUp is now active, and you can now invite your Participants. You will also see the active Organizer view navigation bar when you next enter the Signup.
For a quick video tour of all your Organizer views and options, please click here: Managing your SignUp