For those who are having trouble finding the mods folder can use a simple tool to install them Here's the link actually linking to the forums post3986172.html?hilit=modinstaller#p3986172 Modinstaller 5.0.8.jar&lang=en&cat=download.php&art=&desc=Modinstaller 5.0.8
I've used it in 1.11.2

Very strange the picture doesn't seem to be showing maybe a link problem??