Two of my gas burners do not light
I can hear the electric igniter and smell the gas
What do I need to do?

Most igniters hit all the burners at once... just because you hear it snap doesn't mean its working on more than one burner. You have to look at it... maybe clean the burner... and if that doesn't work call a service tech... because if you don't know what you are doing... it can be very dangerous.