Not exactly, it depends on what you want to fix. You can submit many reports each day. AMPSport will record only the latest of your entries and overwrite all other wellness entries for the same day.
If you want to "edit" a wellness report from today, you submit a new wellness entry from website using the stethoscope icon.
Click on the date field to update the wellness entry date.
If all you want to do is edit (or erase) the comments you made, make sure all of the numbers you put in are the same as they were before, and then in the comments section, put in the new comments you want to save. When you hit "Add," your new comments will overwrite your old comments. Your previous comments will be completely lost and only these new comments (and values) will be saved.