Does anyone know what padding does and how should I use it. I also want to know how I can move and edit objects like the contact search bar.

Padding essentially creates a gap between surrounding content and the item to which you are adding padding to.

Use in a definition file:
padding=rect(w,x,y,z)
Use in a style file:
padding:rect(w,x,y,z);

Where:
w = padding in pixels from the left
x = padding in pixels from the top
y = padding in pixels from the right
z = padding in pixels from the bottom

Thank you very much.