Add a new compartment to recipe, and two new ingredients.
You may need to change the size of the graphical representation with the center wheel on your mouse.
You can also drag elements around on the canvas to change their location. Drag one ingredient inside the compartment, and one on the membrane surrounding the compartment (as shown).
By default, the whole recipe has the name “root” and the compartment has the name “newCompartment0”. You can change names by right click on the background or in the compartment.