By default Jamba expects you to drive with a master toon and have the other (slave) toons mirror what the master toon does. To do this, you need to manually open the NPC dialog on each toon and then start clicking with the master toon.

Other options let Jamba-Quest automatically do things. You still have to manually open the NPC dialog on each toon. You can use /assist and the Interact With Target keybinding to help you with this (search for it).

So... at what part of the process are things not going as you expect them to go?