I bought this game 3 days ago and I'm either making something that is very easy very complicated or I'm just not understanding the tutorial. My problem is trying to assign new citizens to jobs. The tutorial tells you to drag them to what you want them to do. I do that and then on my next turn they pop back up in the city ready to be assigned a job. What am I doing wrong?

My citizen are abandoning the colony because of no food. Please help!