If you are new to Fitday, you are probably using Fitday2 (not Classic, a version that some people still use). Go to the Log tab at the top of the page. Clicking on the tab will bring up the food log. You can do a search of a food there and put in the quantity. This will start a running log of all the foods you eat in a day with the total calories for the day. The macronutrients will also show up in the log (protein, fat, etc.).
As to Buckwheat sprouts, I couldn't find them to put them in the log (searching the database). I'm not familiar with that food. I googled it and found that it is buckwheat groats that are sprouted to make 'buckwheat sprouts.'