Its rather simple, assuming your screen looks like this
one
You start by selecting your game(Dppt/HGSS) then your nature(timid) then your Hidden Power(Ice) and its Power(default is 30 change it to 70). Then for IV's the default setting is equal to or greater than( looks like this > with a line under it ) if you want to change that there is an =(equal), <(less than or equal to) or the HP(I don't mess with this one). So for HP Ice, we want everything aside from Att to be greater than 30(you can also leave speed at 31). so change all the stats to 30 except Attack which should be to a 0 and at least the def to 30(as a 31/X/30/31/31/31 spread still gives HP Ice). Then Delays, Min should be about 100 higher than your calibrated(580-600 for HG/SS) and Max should be 2500-5000(whatever you're comfortable with). Leave a 0 in the min/max frame and it will search for all frame spreads and then search.
EDIT: Since you can only hit odd frames change the any delay to Odd and it will display only odd delays then.
Also Synch frame is if you are using a synchronizer(Abra/Ralts/Espeon etc) with the desired nature(timid in your case). If not use the non synch frame.