Start the game, and enter the scenario you wish to play. There, just type the codes, there's no prompt or pause or console. Don't be confused by the buildings that will appear at the cursor, ignore them.

Code	Effect
chnobarbarian	Barbarians wont attack
chcureall	Cure everyone
chnofire	Fire will never occur
chnofood	Food is not produced
chfreebuild	Free Building
chnomaterials	Materials are not produced
chnomorale	Morale is not "produced"
chnocrime	No more crime in town
chnoplague	Plague will never occur
chnoriots	Riots will never occur
chstartbarbarian	Start barbarians attacks
chstartfire	Starts fire
chstartplague	Starts plague
chstartriot	Starts riots
chstopbarbarian	Stop barbarians attacks
chstopriot	Stop riots
chstopfire	Stops fire
challhistory	Unlock History Timeline
chgivemeall	Will give you 1000 of everything
chwin	Win scenario