Instructions
Press and hold the key or button to which you wish to assign the spell or spell-like ability. The "Quick Map" menu will appear after a couple seconds.
Scroll down the list of spells and abilities until you locate the spell you wish to bind to the key or button.
Select the spell or power you wish to bind to the key or button, either by clicking the left mouse button or highlighting the power and pressing the "A" button on your controller. This automatically binds that power or spell to that key or button.