Eeh.. Push to characters and software updates are two seperate beasts.

'Push to characters' is a facility within the mod to change the Jamba settings of your other toons in-game, all at once. So you don't have to change settings x5. You set up your team on all 5 windows, and from then on only need to change settings on one window, and 'push' them to the other characters on the other windows.
See here to set up the group: http://wow.jafula.com/addons/1-jamba...ure-your-group
Then simply press 'push to characters' button when in the Jamba settings ( /Jamba ) to do that.
Jafula has written up detailed explanations about Jamba, very helpful indeed to any beginner.

Updating the addon itself (eg when a newer version comes out) is a different matter, and the neatest way is to use symlinking, if you know how to do that. See also here about symlinking:
PowerShell script to create symbolically linked (mklink) copies of WoW

Which one were you after?