Couple questions from somebody who just downloaded

[dreadzero]

So I just downloaded LUI and started messing around with it. I like it so far but I got a couple snags on stuff I am having trouble changing.
The first thing I don't understand is: why when I open my bags it says I only have 4 bag slots when I know I have 5 bags?
2. I put all my action bars out and made them bigger but now my casting bar is covered up. How do I move my casting bar to somewhere else?
3. Is there some setting inside LUI to change the key bindings for the action bars or do I do that through the standard wow key bindings?
If anybody can help me with this stuff I'd really appreciate it!