Renn

So everytime I go onto the Technic launcher, go to Attack of the B-Team and click play. It starts the loading and eventually it works, and disappears, but then nothing else comes up and the technic launcher just comes up again. I looked at a video on how to install and I did everything right but after the mod loads, the technic launcher goes away (like what the tutorial said) but then the technic launcher comes up again instead of the modded minecraft (unlike what the tutorial said). Please any help would be huge, I really want to play and am getting kind of frustrated. Thanks.