These steps are good for all Mazda Miata years 1990-2005.
Same as you would for any 1999-2005. See related links below.
with a hammer
How do I adjust a stoplight switch on my mazda 626 LX V6
From inside the trunk.
brake lights dont work
If you fill your tire to right PSI the light will reset itself.
2002 Mazda Miata MX5 center high mount stop (third 3rd brake light) light bulb lamp replacement: Purchase the correct replacement center high mount stop (third 3rd brake light) bulb(s) first, before disassembling the vehicle. See sources and related links below for replacement bulb information. Then consult your owner's manual for the center high mount stop (third 3rd brake light) bulb replacement procedure. As simple as it sounds, the owner's manual is the best place to start for bulb replacement instructions and illustrations. If there are multiple bulbs, you may want to consider replacing all at the same time in order to keep brightness and color equal (optional).
Yes.
Remove the high mount brake light retaining screws from your Mazda Protg. Remove the high mount brake light wiring harness. Reverse the process to install your new high-mount brake light.
Reset the change oil light on Mazda 3
what do you have to do to change the center brake light
There is none, except for Japanese versions if I recall.