Hot Bars - Creating and Using
There is a picture guide located here -->
Hot Bars - Creating and Using --- 
which our very own cookie Queen Mum kindly put together
Q.
Does anyone know how to have multiple hotbars?
A.
Right click the existing Hotbar and select the New Hotbar option.
You can assign the keys used through right-clicking as well...
Q .
Can you align the hotkey bars vertically?
A.
There is an arrow (hidden of course) on the lower right. Hot Tips If you want to change what a button does, you have to right-click and then Remove Item to be able to reassign it