The knob to your far right is the striker for the burners only.If working properly you should be able to turn on a burner and give the striker knob a quick turn hearing multiple clicks and it would light the burner on the stove top.
To light the oven, you have to turn the oven knob to the pilot position and push in on the knob, then hold a lighter to the pilot in the oven. You must keep the knob pushed in until the pilot stays lit, usually about 20 seconds or longer. then let off of the oven knob and turn to the desired temperature setting and the main burner should light.