Not using jamba myself (anymore) but the way you can loot is through interact with target and click to move. So you need to enable a keybind ingame for interact with target (where you set up all keybinds ingame).

Then the process goes usually:

- target a dead mob with your leader
- slaves assist leader and acquire the leader his target
- hit your interact with target keybind so your slaves run to the dead mob and loot it, you obviously need to have autoloot enabled in your ingame settings

Combinations of these steps work as well of course (one could have a dedicated loot hotkey that combines assist with iwt, etc).