Changing my starting weight here?

Hey there. I started out tracking my weight from where I weighed the day before surgery.  Now, however, I want to track from the Pre-Op measurement so I'll be in line with my Dr's numbers.  How do I change my starting weight here so my tracker/signature shows the correct number?  I went into the health tracker and went back to my pre-op date and put the weight in, but the ticker still starts from my surgery date weight.  

Help please. :)

I did the same thing but couldnt get it to update the new weight. So I just deleted the whole thing and then made a new one.  It worked that way.

Deleted the whole what?  Whole account????  But I have friends already darn it!

Ok, I figured out you meant just the ticker.... Thanks!!!