rotating in slicer issue

How can I rotate the stl file in slic3r? I can see how I can turn it clockwise and counter clockwise from the top view but how can I rotate the object front to back from the top view. Some of my parts are importing into slicer up on their end instead of laying flat on the platform. I made sure the home view in CAD is laying flat, but no matter what angle I set it in CAD it will import into slicer on its side every time.

I use Repetier host as my machine interface, which has an object placement module that lets you rotate X Y and Z. Your other option would be to use the free version of netfab and rotate the stl file and re-export it then print. There are probably other methods, but those seem to be the easiest ones.

Thanks for the info. I will give those options a try