Animator: Anim Clip greyed out in Inspector

Hi,
I'm trying to reuse the mecanim tutorial files and want to modify the clip settings within my blend tree but I can't access the clips in the inspector. I'm clearly not getting the UI at this point, and why it wont let me modify the setttings. Can somebody tell me from the screenshot what's happening?
Thanks!

 

Try clicking on the blend tree nodes ("Walks" or "Runs"), not the motion fields ("WalkFwdTurnLeft", etc.). This will let you assign a new clip to the motion field, adjust its time, etc. If you click on the clip, it will highlight it in the Project tab, where you can click on the clip and edit its settings.