I am not sure about the poulan but for a generic chainsaw
I would think that the two small screws are mixture controls. One idling and the other fast running. The large screw would probably be the throttle stop or idling speed contol. If the idling mixture control is out of adjustment it will be hard to start. Usual thing is screw it right in and then screw out one and a half or two turns then adjust when hot and running. If it has a plastic cap these should be removeable.
If this fails you should be able to start it by holding the trigger throttle slightly open with one hand while you pull the starter with the other. If you flood it, and you have flooded it if the plug is wet, remove the plug, dry it and spin the motor over a few times with the throttle wide open and choke off to clear the excess gas from the cylinder and start again. Wd40 or rp7 into the throat of the carby may help to start it also. go easy on the choke also.

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