As I replied in your other post, the "old" Supermodel UI isn't up to date anymore. You can use emuloader to launch your games (even if it's not that straightforward)
For a better control of things, I sugest editing the supermodel.ini file yourself (honest, it's not that hard)
keep in mind that you need a fresh copy of supermodel AND the ini file, because supermodel UI fucks the ini file beyond any recognition.
I know that you are using an xbox controller, so you should enter supermodel.ini and look for
[ Global ] ;
There are some options for choosing your graphics engine here and stuff. To use an xbox controller, you have to add this line:
InputMethod = 1