Pronterface + Slic3r

Hey I already posted a question but I'm also trying to follow another possible way of fixing my problems.
I'm wondering can anyone give me any help on getting pronterface and Slic3r working together on a PI??

I've followed all the steps on the RepRapPro Wiki page and nada, its not working! I installed Skeinforge and it works bu I'm hitting wall after wall with trying to commission and fine tune the whole process

Again, any help would be great

(P.s. Using a Mendel if that makes any difference.)

Thanks.