How do you add non-free repositories to OMV?

Hi guy where do I need to go to add some of the debian non-free repositories to OMV? I'm trying to unrar a .rar with multiple parts and the free version of unrar doesn't seem to support it.

http://raspberrypi.stackexchan…-to-install-unrar-nonfree

http://forums.anandtech.com/archive/index.php/t-2073537.html

I tried adding the repositories and it didn't seem to work.

Thanks for the help!!

I found this guide.

Problems with sources.list?

I ran through all the steps just fine, but I can't get the omv-update to work...

Can't I just do an apt-get update?

Ran apt-get update and it worked just fine. I added the repos from my first post before I asked the question... for some reason it didn't work... maybe they were bad... either way its working now. I'm going to look for the extras plugin cause it might come in handy, yet I enjoy using ssh.