Same here - had to go back to Baby Bunting and have them show me. The capsule does not fit into the plastic "U" shaped sides - it attaches via 2 metal bars. The first being the U-shaped bar the fits into the adapter (that's what I call the thing that snaps into the side of the pram under where the hood snaps in). Once you have the u-shaped bar firmly snapped in, then you "rest" the SNS Unity on the bar - it doesn't really snap in either but when you add the 2nd metal bar (the one with the velcro strip), you get a pretty secure fit. The last thing you do, after you have your baby in the SNS capsule is lock the safety strap which is the nylon strap with the clippy buckle thing which goes around the top of the capsule - basically above the baby's legs. It's not a pretty system, but we use it all the time and it works - we do check it often though.