Fire Emblem: Radiant Dawn - GC Controller

[DrawVid]

I cannot seem to find the option to use a GC controller in the options menu of Fire Emblem: Radiant Dawn.

Any help would be greatly appreciated - currently pulling my hair out over this and it's probably super simple...

[DrawVid]

I'M THE WORLD'S BIGGEST IDIOT.

My GC controller was plugged into slot two of the GC adaptor not one....