Adding a custom title on before markers on Google Maps

Hello,
I managed to customize the Google Map as i wanted to, with the help of wpmudev staff and now i need a final "touch" :slight_smile:
I wanna add a custom title before the markers of the google map. My current map is like this one (http://i.imgur.com/SkGPHWq.jpg) and i wanna add a custom title to make it look like this one (http://i.imgur.com/wt4kFl1.jpg). In which file can i do this?

Thanks in advance.
Regards.