well, youve got to wait and see if its just the yolk and umbilical cord which will resolve or a bigger problem. Try to take pics...but there isnt much to do. Chicks are fine for up to 48 hours and can stay in the incubator, so dont be in a rush to move it as long as its safe. Part of hatching is that the yolk sac gets absorbed, and sometimes it looks a little nasty. but they are always shaky to start. remember, they have been through a terrificly hard experience and are exhausted.
Just wait and see....in 24 hours or so offer it water in a shallow dish with marbles in it and some chick feed...put it in a brooder that is 100 degrees (I use a fish tank with a heat lamp on one end so they can move away if its too hot.)
Take a pic and post it...but chances are the thing will look better as the day goes on and by tonight youll be hearing loud peeping...., if you arent already;-)