Hello once again!

i just got my rally vxl today! i also purchashed a sigma eq mini charger, the guy at the local hobby shop recommended it since it will be able to charge everything when i upgrade. so i get it home and im kinda confused about it. i was able to get it to the setting for a NiMH battery, and able to start a charge. But for some reason i cant help but feel like its not working right, basically does anyone know a website or some internet material i can read over? the instructions with the charger are very confusing ( hobby shop is closed for rest of the weekend so i cant go back there till monday =/. any help is greatly appreciated!