The reset button on top part of burner will not pop out - we ran out of oil and the heater stopped, now with oil replaced we do not know how to start - please help!

The best way to bleed out an oil burner is to do the following:
1. Open the bleeder port on the fuel pump (left side of the burner) and place a small pail under it to catch the oil. Use a 3/8th or 7/16 In . Wrench.
2. Hit the reset button.
3. Place a jumper wire across the F-F terminals on the control that has the reset button (this will keep it running until all the air is bleed out). You can use a piece of wire, or hold a wrench across the two terminals.
4. Let it run until all the air is gone.
5. Close the bleeder port tightly and the burner should light.