How is it attached?

Laszlo

I use velcro to install all of my seats.  It gives me the option of moving/removing the seat if needed.  Generally, I replace the velcro about once per year when the adhesive gets a little weak.

I find the seat supplied with the kits to be rather minimal.  The Happy Bottom seat is a reasonably priced upgrade.  If you are looking for something really comfortable, check out the seat the Redfish Kayaks sells.  I have this seat in all of my long distance race boats.