I have the same question as you.
I don't know how to get the answer.
There are a few more similar queries / comments in the software discussion group but I did not see any helpful info.
The FitDay owners / staff apparently have let their entire website fall behind. Nobody seems to be performing maintenance.
All this site does is provide an advertisement of their downloaded program for purchase... and even that is failing to perform properly as I've seen people post that their payment has been accepted but that the download failed.
Hi! I just signed on today, and noticed right away that I couldn't track my sugar intake so I totally agree with you. It's so important to be able to track sugar intake, so I hope the site changes to accommodate this!