I'm a complete noob, but everything has been going well. I started RSN last night and I went straight into service mode after the tutorials. On the very first service, DB 80101, I got the objective to "Couple to formation. 15 Vehicles" I've tried everything, backing into them, searching for a button to couple them and searching google. I'm at a complete loss. Is there a bug idk about, or am I missing something?