1. As my Espace have everything for a bord comp, can it be activated somehow? I mean that I have the control button and the display can show everything but when I press the button nothing changes! Onfy if I hold it for a longer period of time the the trip counter resets to "0"
No, if it wasn't an original option, then it can't be activated afterwards, sorry.
2. I have the factory CD-Changer. Is it possible that it can't read CD-Rs or maybe it is for cleaning?
No, many of the Renault CD players cannot read CD-R's. They put out a technical note to this effect at one point because so many people were complaining the CD sets didn't work. They did work but will only play original CD's.
3, Where in this van is the place for the First Aid kit??? I can't find it! (and I hope that I never need it but still it is better to know where it is and don't need it than need it and not be able to find it!)
If you mean where is the Renault provided First Aid kit, are you sure the car was supplied with one in the first place? They are certainly not provided as standard here. If you mean, where should you keep it, when you buy your own First Aid kit, then that is up to you, there was no special place made for a First Aid kit. There are so many different types available, in different shapes and sizes that any designed place would not hold all types anyway.
Roy