How do you change fuse on Hyundai elantra?

you didn't specify the year, but there should be a little access door for the fuses to the left of your brake pedal. on the inside of the door, or next to each fuse there will be a diagram telling you which fuse goes to what. just pull out the old fuse with a pair of needlenose pliers and push in the new one.

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On my Hyundai Elantra, the interior fuse panel is hidden.

The interior fuse panel is located behind the coin holder pull out drawer, which is on the lower left side of the dashboard under the steering column.

Of course there's also a fuse panel under the hood, right next to the battery.

Since my Elantra came without an owner's manual, I had to download it & find out which fuse does what from the download.