Can you post the model number please. Its usually on a sticker on the inside of the door and starts E-nr
Ok no worries.
But from the sounds of this if you have the red key then the child lock is turned on thats why its not starting.
Try this and see if it turns the key sign off.
Press and hold the start button for several seconds and see if that turns it off.
If not then if theres a finish in button (picture of a clock) then press that fr several seconds and see what happens.
Try them as they are the 2 most common ways of turning the lock off.
If they dont work then just post back tomorrow with the model number and i can double check it for you.