ah. The actionpage keybindings are the buttons used to immediate show the action bar in the base location (where your action bar is on a new character) the defaults are shift-1 to 6

by default these map to the action bars as listed in Gurblash's post
Action bar 1 is your main bar
Action bar 2 is your secondary bar
Action bar 3 is your bottom left bar
Action bar 4 is your bottom right bar
Action bar 5 is your right bar 1
Action bar 6 is your right bar 2
if you look further down the keybindings you will see the bindings for each key on the action bar.

tbh though right about now, I would be downloading Trinity Bars 2 and save yourself a whole heap of hassle. (you can create any bars you want and assign keys straight onto the buttons.