You can not open the panel it self. to top the windscreen washer , face the car and you will see 2 small grills under the windscreen , remove the one to the left , you can see a small plastic bolt in the middle of it , just turn it half a turn and remove the small grill , look inside you will see the windscreen water canister , remove cap and fill with water , close cap , put the grill back , lock with the bolt , and you are done. good luck