how do i turn off the spanner symbol on the dash of my citroen picasso 51 plate

1) Ensure "ignition" key is turned off. 2) Depress and hold the odometer reset button whilst turning the "ignition" switch to the on position. 3) Keep the odometer reset button depressed for 10 seconds whilst the service display counts down from 10 to 0. When the count down reaches zero the spanner icon will vanish from the display and the service indicator will be reset.

You are absolutely right

Done all that but when staring the car up it say cc--- then off