The center grill was designed for making things like pancakes. Normally, that burner is set a little higher than minimum flame, not for high flame like your other 4 burners. The red buttons are thermocouple safety switches for the oven. There is a pilot by each oven burner that is supposed to be lit. Pull the top front burners out and look for the 1/4" tubes that lead out from the burner manifold. There will be a small pilot valve that's probably closed. Using your flathead screwdriver, turn the valve either way 1/4 turn to release some gas to the pilot valve. Light the pilot valve. It should be nice blue small flame touching the tip of the thermocouple. You can adjust the pilot valve so that it's not too high but not so low that it can blow itself out by closing the oven door quickly. After about 30 seconds, press the red button to reset the gas safety valve and the oven should operate properly.
Hope this helps.