The modeling perspective toolbar should include a (Launch the application) button - see also http://www.tersus.com/#Id=1320. This button (alongside others) is only displayed when a model editor is open. If no model editor is open, you can open the root model of the application by double-clicking the project in the Repository Explorer view. If a model editor is open but the button is still missing, try resetting the perspective via Window>Reset Perspective.
Regarding your report that maps3v on our site hangs (Try it Online tab of http://www.tersus.com/#Id=4448), I've just tested it using Firefox and it seems to work just fine.
In both cases, if you're unable to resolve your issues, perhaps try to provide more information/screenshots, in order to rule out any misunderstanding on my part.
For best results, use the Firefox browser..