A catalogue is a database where you can put your disk images or your templates.
You must first make sure that the user with which you are connected has rights to create catalogues. You can use this guide to check:
In the "Catalogs" tab you can click "+" to add a new one:
In this menu we ask you first to give a name to this catalogue and a description. Once this step is validated you must set the access restriction by adding users authorised to use your catalogue. (The user must be able to use the catalogue). During this addition, you will be able to modify the rights by authorising users in read only or in read/write mode:
After adding users, go back to the window with the user list where you can change their rights:
Once this step is completed, you will see the catalogue added and by clicking on it you will be able to add distribution images in "Support" tab: