how to install this 2.1.7 product? video tutorial is confusing

I just downloaded the .tar file for 2.1.7. I extracted the files. I tried to follow the installation instructions at www.mobilejoomla.com/documentation/12-getting-started/40-installation.html.  But the video is not clear.  When I typed in "localhost/mobilejoomla/administrator" in my browser's Address field, I received "site not found"  so I cannot access the Mobile Zoomla administrator/control panel/

Hello webmaster2016,

The localhost/mobilejoomla on the url is for the users who's using a local webserver and the 'mobilejoomla' is the directory of my Joomla site. 

Do you have a live site? or are you working on your localhost too? Please send us a screenshot so that we can provide you more instructions.

Best,

John Mark C.
Mobile Joomla! Support