I have one and like it. The manual should help you out but for what you want to do; hit battery type until you get to the nimh selection, hit the start/stop/enter button until the charge rate flashes and then use the DEC or INC buttons to change the value to 0.30A for that size battery. (about 1/10 the batteries capacity). Hold the start button until it starts charging. At 0.3A it will take about 10hours to charge fully.
I sometimes get false peaks (charger shuts off to soon) with nimh batteries when charging at a faster rate.
Nice charger, simple and easy to use.

Tom