Using the rear ashtray
NOTE Damage to the stowage compartment under the ashtray due to intense heat
The stowage compartment under the ashtray is not heat resistant and could be damaged if you rest a lit cigarette on it.
Make sure that the ashtray is fully engaged.
To open:
pull cover 
out by its handle edge. To remove the insert:
push ribbing 
from the left side and pull insert 
upwards and out. To fit the insert:
fit insert from above and press it down into the holder until it engages.