You should be able to go back to the date of the entry, put the correct value in over the other one and save.
Does that help?
Fitness Minutes: (0)
6 2/26/13 5:14 A
Just started tonight. I typed into the wt section (and foolishly saved it) the wt I was- last time I wt a few wks back...unfortunately for me....I went in and weighed...I've gained wt, so want to put that CORRECT wt into my starting wt tonigh,t so my wt loss will be measured from tonight's PROPER wt!! HELP!! I have gone back and TRIED to change it ...can't figure out how!?? Flustration building and I JUST started about an hr ago!!! GGggrrrr!!