You need to get Swamp Tar and take it to the chemist in Rimmington where he can turn it into oil.
Buy a tinderbox from any general store then use it with your lantern.
Use a tinderbox on the lantern.
Use a Cut Emerald on a Bulls-Eye Lantern that doesn't have a lens.
You use a tinderbox with it You take some Swamp Tar to the Chemist in Rimmington. Click and use the Swamp Tar on the lamp oil still (the small one, not the big one outside his house) and dip the...