When I have selected a heat pump in the list, should I then go to "change settings" and enter the temperatures that apply to my project?

No, the values you can see under testing under the heat pump settings must describe the circumstances that prevailed during the heat pump manufacturer's tests. You enter the temperatures that apply in your project under the settings for the heating system. The program calculates how the heat pump works during all operating points depending on the outdoor temperature, flow temperature, heat demand, etc.