Under a valve usually .
Pour 1/2 teaspoon of fuel down the plug hole & try again
If it fires & runs a bit you might need to do this 1/2 dozen time before it gets burned / blown out
You will probably need a couple of spark plugs as well
Did you drain & clean the carb?
Slide it off, leave the fuel line on & blow air through the carb
Compresses air, leaf blower hair drier etc
Atomised fuel mist should come out the other side
Do this for a minute or two then put you hand in the flow & check for droplets of water