Before you start your own experiments, perhaps you should try this:

To view the orbits with the default values, click on Play and observe how the three Suns chase one another along a circle. By adjusting slightly the masses and/or the positions and/or the initial velocities of the bodies, you can control the shapes of their orbits.
This is how you change the default values. Click on Pause and then on Reset. By way of an example, to change the mass of the red body, hold the mouse cursor over the first field that displays the value 1.550e30 in red. The label reads "Mass0". This is the mass of the red body. Click into the field and change it to something else. The background color of the field changes to yellow while you are editing the number. Hit Enter when finished. The background color changes back to white to indicate that the edit is finished. You can change any of the remaining default values by the same technique.
(Caution: any change will result in non-circular orbits.

When making other experiments with the model, always remember to Pause and Reset before changing any defaults.