Go through "Tools" beside excercise and advice up there 1st. That'll give you what you need to be eating a day etc.
Then when tracking food go to "logging". To search up food type it into the search bar within logging and then when you've modified your amount choose add to log...
Is this what you mean by application?
The side effects of allergy medications keep some people from using them. Natural remedies can be a great alternative, but some are more effective than others.