As far as I know Jamba doesn't actually set up that part for you. It's only for assisting multiboxers, it does not replicate key or mouse strokes. For that you'll need a program such as KeyClone or ISBoxer (easier to set up) or AutoHotkey/HotKeyNet (if you're confident in scripting). Or a hardware multiplexer if you're using multiple PC's.

Once you've got one of those you'll have to read the stickies or the wiki for information on how to use focus or target targeting. Basically you can have your slave(s) /focus your leader or /target your leader, and in each spell you use something like the following.

/cast [target=focustarget] Frostbolt

or

/assist
/cast Frostbolt

I too am partially a clicker, I use HotKeyNet to broadcast my mouse clicks for most buttons other than my main DPS spells. http://hotkeynet.com