Snakebite wrote:Left Click on it to pick it up...
Hold down
Shift and
Right Click it on the item you wish to use it on...
Taaadaaa!

I think Snake nailed it

.
Unfortunatly there are several actions to interact with items ingame (due to different actions via game mechanics):
-right click on item (mostly with equiping them, but also with leveling items, some "hacking/opening" items,..)
- left click to pick up 1 item and right click on another item (mostly interaction with fixed item, like using mission key on door, also with some tradeskill actions, like duplicating mission key)
- left click to pick up 1 item and shift+right click on another item (most of tradeskills)
One of those 3 actions will work in 99% of cases. Unfortunatly there are times when neither of them will work. This can happen because :
- tradeskill/item is bugged (you can try and petition it, GMs are likely to help you, example of such case was building NotuComm Treanchcoat several years ago)
- lag (items won't combine or won't even show to have any tradeskills, relogging usually helps. In cases of missions, petitioning usually won't help, since you can simply delete key and pull new mission. If it involves SL quest, which you can only do once, ARKs/GMs will help you if it's in their power)
- coding problems (with new stuff added to game, devs can forget to add "manual action" like using key on door [they only add run into zone area of door for automatic zoning in]. This didn't happened to me yet, so no idea what to do if you encounter this)