Hi transportation researcher !
In the general parameters (the tools button on the upper part of the screen, you will find a place to paste your google maps API key.
Then, create a short text question.
You should find an "advanced parameters" section in the question parameters. In this section, you will find an option like "use map service". Other options let you define the map size, etc... The default place field has to be filled with the defaut LAT/LON position, like 44.8403 2.4609 for example.
I hope this will be helpful.
I am off this week end, don't be surprised to have more help.
Good luck

Another transportation research
PS : the solution I propose dealing with changing some code is just a way to look for a place before placing the pin. I guess it's not usefull in your case.