Before I tell you this I must warn you that you are going around a safety device that is on your burner for a reason. You could cause serious injury to yourself and others that could be around the burner.
Next, do you have a thermostat atleast? I only ask because some burners work on high limits to control heat while others work on thermostats with a high limits as a back up. If you just have the high limit don't use the burner before you replace the switch, if you have a thermostat well here you go, but still replace that high limit asap.
Two wires go to the high limit switch, trace them back 6 inches to a foot and cut (Power is off I am assuming). Take the two wires that run back to the burner unit and twist them together. I would insulate the wires as well, ie wrap electrical tape at the very least around the twisted wires. The high limit switch works either on or off, and on lower temps then the high limit a 12v circuit is just completed. When the high limit is reached it breaks the circuit which blocks fuel from being allowed to the nozzle.
Burners are pretty simple, high limit, thermostats, and flow switches are just completed circuits and typically run one to the next.