To define toe floor contact for a character:
> Show/Hide > Finger Tips in the Character Controls to make the toe tip markers on the character visible. In order to see the toe tips markers, you may also have to temporarily hide the FK and IK markers on your character by disabling them in the Show/Hide menu.
These options let you decide how you want the toes to react when they come in contact with the floor. If you have no floor defined for the feet, the toes react to the plane at 0 on the Y-axis as the floor.