Where are the directories located

I have installed Multy Site and all looks almost okay. I've selected to use subdirectories, not sub domains...I have created the first site, which name is sanjuanbautista and it has 4 pages. You can access it from this URL:
The thing is that I'm trying to access to this directory to see all the files in it, but I can't find it. Where is it located?
The url of the mine multi site is http://www.aqplink.com/
Thank you