What class are you trying to use it with? Having a close range spell like Fireblast (mage) and long range Fireball it lets you set these up by enabling the custom spells. After clicking that button you have to type in the name of the spell exactly the way it appears on the tooltip. Now the last part had me stumped for a while because I like to embedd my spellcasts into macro sequences. ***Rangehelp can't find the spell unless you put it on your action bars.*** So even though I used my spells in the macro sequencers I kept a seperate button with the range checking spells hidden somewhere out of te way. Works like a charm after that. I like that you can change the UI indicator too so I actually put "FIRE" and "FROST" and color them red & blue respectivly. It really is way cool.