Included in the box is a metal stinger, an allen wrench, rubber plugs and a metal pin.
You attach the stinger to the headtube like this:
Then you slide the bike seat into the stinger and lock it into place with a metal pin.
The iBert seat attached to my Trek Allant bike.
I can't wait for Bea to ride with me. The instructions recommend, however, that she be at least 12 months old. It is designed for kids up to 4 years old.