Owners manual will tell you.  Or take a flashlight, remove each fuse
and look at it. You'll see visually which one has burnt through the
fusible element.

My fusebox is on the leftside (driver) kickpanel up under the level of
the dash.  Pretty hard to see in there unless you crawl in with your
back to the floor with a flashlight to look upward.  The pop-off cover
should have a template inside showing what fuse is for what.  

Don't rely on looking at the metal loop inside the wafer fuse to
determine if it is blown.  I had one that looked good but down below (in
the less transparent part) a section had blown out enough material to
leave behind just a thin piece.  An ohmmeter showed continuity so the
fuse looked good but at higher amperage there was too much resistance.
Took me a long time trying to get my radio fixed.  Worked when wired up
using patch cables to the battery but not when in circuit.  Then I
decided to just go ahead and swap the fuse and, voila, it was fully
functional again.  Then I dissected the fuse to see why it looked good,
tested good, but wasn't good.