This is one of the four search algorithms built into EvalC3, and visible as an option when you click on any one of the four Explore links on the right side of the Design & Evaluate worksheet.
If you choose option 3: Evolutionary Search this will set the Solver add-in in motion, using its default settings.
If you want to change these go to the Excel menu bar, click on Data>Analyze>Solver. When the Solver Parameters box pops up click on Options box, then in the next pop-up click on the Evolutionary tab.
To find out more about these settings look here: https://www.solver.com/excel-solver-change-options-evolutionary-solving-method
When you have made your choices click on the OK button. Then Solve, to use the algorithm immediately, or Close. Either way your new settings will now be the default settings in EvalC3 until you decide to come back and change them