YJSG comes with the option to place the top menu next to the logo faster and easier.
Go to template manager tab Top Menu and set parameter Top menu location to In header an hit save.

This option will move your menu from it's default position:

next to your website logo:

To adjust your top menu position just add following code to site_root/templates/yjsg_template_name/css/custom.css file:

example:

#topmenu_holder{
margin-top:15px;
}

If you wish to float your menu, just add float to #top_menu div id:

example:

#topmenu_holder{
margin-top:15px;
float:right;
}