It should have either a sort of "finishing post" behind it, if so it is the miles done since the trip computer was last reset. Pressing the end of the right hand stalk will show other data such as average speed or fuel consumption over that distance.
Citroen Xsara Picasso 2006 LX - F22 (20Amp Yellow) - fuses behind panel below steering wheel to the right.
There are two places for fuses on the Citroen xsara Picasso the main ones are to the right of the steering wheel behind a little storage area just pull the recess out and the fuses are there the other is under the bonnet.
You may well need to replace the small bulbs/lamps behind the dash.
behind nsf wheel on end of gearbox end cover 19mmplug head
There is a switch behind the brake pedal. Fairly easy to replace, or a 10 minute job at a garage.
It is located underneath your intake manifold (so if you look at it from the front it will be behind the back of the motor underneath the fuel intake manifold)
it is behind the display in the centre see previous questions on how to change display bulbs, in oreder to be able to change the bulb.
The horn on a 2006 Citroën Xsara Picasso is typically located behind the front grille, near the radiator. To access it, you may need to remove the grille or some components in the front of the vehicle. It's advisable to consult the owner's manual for specific instructions or diagrams related to your model.
Remove the fuse board cover at the right hand side of the steering wheel, the switch is located behind the mass of cables, a quarter turn to the left will allow the switch to be removed.
No braking lights is usually caused by the failure of the switch behind the brake pedal. It's a fairly easy job to replace, but check it isn't a simple fuse failure first
There is a small micro switch located within the door of the boot somewhere? if this is faulty it will release the boot by itself. I think it is located either behind the boot door internal panel or behind the exterior boot door handle you press to open.
If by 'behind' you mean underneath, it's the asthenosphere .