Help with bipeds

[wadewilson]

So i'm not too familiar with biped animation and i'm having some troubles. I'm loading a preset biped animation int a biped but the biped is shifted to a different place in the scene. I can't work out how to alter the starting point of the animation...when I set a new keyframe for the starting position, it only does so for that one frame...the rest of them are as before.

Does anyone know how to change this?