The Generating Formulas and Options panel is where you specify the equations for the dynamical system. The system being graphed is the one with the current tab open. So if Complex Plane is open then the dynamical system uses the z = ... equation and it is graphed on the complex plane. If the Real Plane tab is open then it will graph x = ... and y = ... parametric equations.
As was discussed in the introduction, the program's main purpose is to allow the user to experiment with their own formulas in the dynamical system. To this end, equations are not hard coded into this program, all equations are input by the user, parsed by the program, and evaluated through general expression evaluation methods. The generation of images is much slower then if the formulas had been hard coded. On the other hand, the user is not limited to viewing only specific fractal families, as they would be with programs that hard code formulas.