Translation of modulate in Spanish

I was wondering if you can tell me if few words how to study here because I don't know that's why I'm not on line most of the time,thanks. Can you help me explaining me how to do the lessons, I still don't understand it
We stayed in this place for quite a while as it was the most spectacular place we have visited so far. It was unbelievable how much thought was put into construction of these magnificent sites.
At around 6pm. we were back at the Chilean border and we were happy to change cars (to the mini bus again) and seeing a paved road. It took us another hour to get back to our hotel.