you press the L button
You have to press the Lt button.
the fire button brae XD
Press A and then Right Trigger to throw a grenade.
Flying Banshees is confusing. But to pilot a wraith you use the normal go forward button and to shoot the big electric balls you press the fire button. To use boost you press the grenade button (like a ghost)EDIT: To fly a banshee, you push the go forward button to go forward, the backwards button to slow down, the left bumper for tricks and spins and the grenade button for using boost. I'm pretty sure they are all the controls for flying a banshee.
Press Y and fire.
Press the Start button.
press x button
In Halo: Anniversary, you press the 'back' button on your controller to switch to the old graphics. It is left of the Xbox Guide Button. You can only do this in Halo: Anniversary.
press the triangle button
press the start button
you hold the fire button
press the X button on the campaign selection menu.