How to do it optimally?

Call me retarded, but whenever I use MyFitnessPal, it's a bit hard to get a lot of things right since I'm not from U.S and some food brands that I eat aren't even there. I'm currently 80kg, and I want to reach 90kg in a year time, which seems like a slow enough bulk, and it says that I need to eat ~3230 calories a day, however, eating chicken & rice 4x times a day + breakfast containing eggs and other good stuff, I get about 2600 calories, but I am gaining weight...

Should I buy a food scale? Are there perhaps some very easy to use guides that helped you track your calories intake? Thanks