Sorry it took so long for me to respond on this.. RL has been getting in the way.

Ok I have default bliz ui and then I have 2 macaroon buttons on Bar 1. (I cant even remember how to add buttons) If I click on the map icon and select bar edit I can highlight posses. I can change the Bar1 buttons to posses. When I do this it shows me a longer bar thats blank.
So far so good.

I can put buttons in the blank bar by typing /mac add but once I do that I have no idea how to set the buttons up. I just need key 2 and key 3 to do the posses/vehicle action of bliz default key 2 and key 3 actions.
Ok, to add buttons you can go to bar edit mode (which you've already done) -- left click on the bar until the state is listed as "posess". Then RIGHT CLICK on the bar and click the "button count" button -- scroll your mouse wheel up and down to add buttons (I'm assuming you probably want the standard 12 buttons).

If you haven't fussed with the buttons, they should show up automagically as "Action ID 121", "Action ID 122", etc. All you need to do is /mac bind and bind them to the keys you like.


IF THEY DON'T show up as Action Button 121+, then you need to do a small bit of noodling... Enter /mac edit mode and left click on the buttons until you reach "Action ID #" (where # could be any number). Then right click on the FIRST button in that bar and it'll give you a little slider that lets you choose the starting number for that action ID -- choose Action ID starting number of "121".

Now /mac bind and give yourself the bindings you want.




In general, I like to use my own "dismount" button for exiting posess vehicles -- I'll /mac edit and left click on my last button on my "posess" bar until I reach "Macro". I then enter the following macro by right clicking on the button:
Code:
/script VehicleExit()

I think the tricky bits you're running into is that it sounds like (though I'm not sure) you might be using the blizzard standard bar along with your macaroon bars, and they might be colliding for the posess vehicle buttons... What you might want to do is /mac menu and un-check "show blizzard bar", and instead create a new macaroon-only bar for your standard 1-0 buttons and whatnot. That MIGHT resolve your problem -- I use 100% macaroon buttons and only rarely will I run into a problem with vehicles (usually the only time I get problems with entering vehicles is when there's HEAVY lag, such as wintergrasp).