My goal is to make a creature that moves by rotating. The problem is that to learn to rotate it is needed to have a relatively high rate of genetic mutations early in the simulation. Later in the simulation the creature stops evolving because the rate of mutation is too high. 

I'm not even sure if it is possible to change the rate of evolution during the simulation. I want to start out with a very high rate of mutation and then slowly, as my creature becomes better, to slow down the rate of mutation. Is it even possible?

You should be able to edit all of those settings from the pause menu during the simulation as well as the settings menu in the creature editor.

Thank you for your reply. I was trying to do that but it seemed it doesn't work. At a closer look it works indeed.