If it is a food you entered the stats for, go under Food tab, then My Foods just below that. Select the food you want to change adn the nutrients will display to the right. IN that box is a button called Edit.
If you mean a food entered in your Food Diary, then just click on the food name adn it will bring you to a screen to change the quantity. Or you can click the Remove link and re-enter it from scratch.
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If you mean a food entered in your Food Diary, then just click on the food name adn it will bring you to a screen to change the quantity. Or you can click the Remove link and re-enter it from scratch.