Main Navigation Menu

I would like to know if, anyone knows how to move the Main Navigation Menu to the left as it is set to default to the right. I checked the Navigation PHP but, there is nothing in there. I also checked the CSS in the Main Theme folder and the Navigation Menu is there but, I am not sure as to which lines to change using Notepad ++
I also contacted the author of the theme at the home site 3 days ago but there is still no reply. Even though the site is still on a local server I can still check it … which I have done and only the Desktop shows the Main Navigation Menu. All, other smaller screen devices continually fail to show the Main Navigation Menu. Also just in case anyone mentions plugins I know for a fact that the few plugins I have installed have nothing to do with this as it has been this way since I installed the theme.