Put on gloves and safety goggles
Turn on sander
Put the metal on the metal plate of the sander
Slowly slide metal forward into the sander making sure to apply pressure downwards onto the metal plate of the sander. Rotate the metal until you have sanded it to your liking.
Once you have sanded your piece, remove from sander and turn sander off
File down sharp edges remaining on the metal
Replace all tools in their proper place