How to Create .umx using modplug

Ok, I broght up this topic in another forum once before, but I didn't really get it. So could Someone who has made umx music many times please give we the exact steps into making umx in modplug. When I try to convert my music into ".it" then to ".umx" then play it in my map...
well, my whole pc freezes and I need to restart my computer
well, my whole pc freezes and I need to restart my computer
