Now that I've trapped a soul in a soul gem, how the heck do I use it to recharge my weapon. I've search the forums and the wiki. The wiki says something about double clicking on it, but when I do that it says you cannot equip this item.

PS3 player here, so if there is text on the screen telling me what to do, I can't see it (SDTV and screen cut off). Any help would be appreciated.

Ah, strike that. I just found it - you have to do it via the weapons screen (R2). Well, how that stupidity helps someone else who was baffled.