First, add files to the file list. They can be of the four file types, see File Types.

This can either mean you "run" the files, or you build an installer or executable with the Master Builder. Select your options from the context menu.

The packages processed will be displayed in the area on the lower left. The tool output during the run will be displayed in the area on the lower right.

The resulting files are saved. Their location depends on the file types.

After a successful run/build, a report is created as an HTML file at the destination specified in URL to Report Directory in File → ToolRunner Preferences.