There are several statuses associated with Projects:
Draft - This is non discoverable and non public facing
Private - This will be hidden from any type of search engine and will only be accessible to those who have the link
Public - This is discoverable and should be used if open to public submissions
To change the status of a Project:
Navigate to your Projects in the Organisation Settings
Select the project you want to change the status for and under View/Share select the Visibility.
Change the status and the update will automatically update.
Once activated, this will become enabled and creators will now be able to submit material.