To create an agenda from the Agendas tab, first tap on the blue ellipsis button. Once tapped, the "+" sign will appear and users should tap this:

A windows will open so users can create their agenda.  Enter a title for your new agenda and then push the "Create Agenda" button:

The new agenda is now created. Users can add assets to it at any time. To add assets immediately, click on the Media Library tab. Tap the "+" sign on the image you would like to add:

A pop up box will appear and you can choose the Agenda you have just created:

Users can add assets from any page in the application, such as a category along with the What's New and Media Library pages.