Missing user and the ability to assign roles after publishing the application

Missing user and the ability to assign roles after publishing the application

  
Dear members,

In one of the videos/tutorials i saw, it showed the ability to assign roles so that selected members can have access to webpages. In order to assign one, there was supposed to be a "User" option at the header besides the "Admin".

However, in my case, it showed only "Admin" and "logout" on the header of the application. Why is the "User" missing? Is there any explanation on this. Please help me. Thank you. 

Please find attached for reference. Anyways, im using Outsystems Service Studio 9.