Add charges to staff in HLO

[romanmage]

Thanks for the help. Pretty new to HLO and after searching the forums and the interwebs, I've failed to find the answer. My character has found a Staff of Evocation Greater and I've put it into HLO. But I can't seem to figure out how to add charges to the staff. When I equip it, it's spells come up on the left hand side of the interface (when I click the "Play" tab that is) but every thing is 0 of 0. How do I get the system to manage the staff's charges? How do I get charges into the staff through the HLO interface?