After installation, Story Mapping app will be available in all Software projects (Business projects are supported in the Pro version).
When you first open the story map, you can start adding Epics and assigning tickets right away. It is a good idea to set up the backlog from the start by selecting a board in top right-hand corner.
By selecting a board that includes more than one project in the board filter, you can use issues from multiple projects in your story map.
Keep in mind however that release information works on a per-project basis, so release mapping will not work when more than one project is used in the filter.
Once the board is set up, you are good to go. Head on to the next section.