Brake lite down

The d/s brake lite is out on my 02 jetta and for the life of me I can't see where to get into change it. I know the wealth of knowledge out there can make this a simple job. Also any idea where to get PC Duron synth, in the Hamilton Stoney Creek area, I,ve tried mostly all the PC stations and only reg. Duron 15/40

TIA to all