Human form. Pretty basic. What ever you have chosen your character to look like, that is your human form. No fur, no ears, or tail just the plane humanoid version of your character.
( This picture was cut from a line of pictures from this site. )
If you cannot see the link attached to 'this', then this is the actual link:
http://jiggsokeken.deviantart.com/art/Werewolf-The-Apocalypse-Garou-Forms-280620066