See here how to assemble and use the Quinny Buzz Xtra.
The Buzz Xtra stroller is designed to perform great everywhere, whether it is on sandy footpaths or the muddy tracks of the forest. It offers maximum comfort on any terrain and is suitable from birth until 3½ years old. With the Carrycot and a Maxi-Cosi Pebble car seat on it you can use it from birth. The comfortable Buzz Xtra stroller seat is suitable from 6 months onwards and can be placed facing you or the streets ahead. In both positions you have a recline function. Break the city boundaries with the Buzz Xtra.
Read more on: http://www.quinny.com/strollers-buggy/buzz-xtra/