It won't allow you to set a goal of weight gained, you are not the first person to bring this up. It's not you, it's the program. But regaurdless it is still a wonderful tool if you are trying to gain weight. JUst write your goal down somewhere, and use the fitday program for what it is best at, and that is tracking calories in vs. calories out. And to keep track of your %'s of carbs/protein/fats.
All you need to know is that if you want to gain weight, you have to exceed your calories out with what you take in. So say your "calories burned" on fitday shows... 2500 (keeping it simple...) If you are looking to gain lean muscle, you should be trying to take in probably 3000 to 3500 healthy calories per day. Maybe more if you enter an intense work out and pump up your calories burned to 3000, then you would want to try to be between 3500 and 4000 roughly. It will still track weight entries, you just won't have a graphed line to compare your goal weight to your actual weight, but if you set a goal, you should be able to see if you are putting on a pound a week, if you are going to reach that goal or not.
Hope this helps!
Started 12/14/2013 @ 300.4
Short Goal (12 weeks) = 270
(11 weeks) 1/1/2014 @ 275.6