This screen displays your charts - only the Weight Chart in MyNetDiary free app, and many more charts in MyNetDiary Pro: Nutrient Charts (in grams, calories, and calories %), Consumed Calories vs. Weight Maintenance Calories, and all Measurement charts.
The Options button allows you to select chart type, period, and other chart options.
On the Calories chart, the green color indicates days with consumed calories low enough to meet your target, yellow - when you ate too much to meet your target, but still less than your current weight maintenance calories, and red - if you ate more than your weight maintenance calories and likely gained some weight.
You can view extended charts and reports on the MyNetDiary web site.