To find the correct fuse(s), you need to consult your owner's manual. The manual will have a fuse box diagram showing which fuse controls which circuits. Look for fuses labeled something like:
* Tail Lamps: This is the most likely label.
* Rear Lights: Another possibility.
* Stop Lamps: These are the brake lights, and often share a fuse with the tail lights.
* Turn Signals: These might also share a fuse with the tail lights.
Without your owner's manual, I cannot tell you the exact fuse number. Trying to find the correct fuse by trial and error is strongly discouraged as you risk damaging other components. Obtain a copy of your owner's manual online (many are available as PDFs) or from a Jeep dealership.