should be automatic light when you turn it on. Turn on your stove burner to purge the lines of air. You should hear a clicking from the furnace if the auto light is working. Does the fan come on? Welcome to the forum
I know our lines need to purge a little (a minute or so) before the furnace, water heater or stove will work. Once they are purged all those should be automatic. You may be able to go outside and light it manually.