[Nottingham] symbols in lyx

[David Wolfson]

I'm trying to write this D&^&*d thesis in lyx, and have hit a stumbling 
block. How do I insert symbols? I can get some standard ones through the 
math mode (eg '\alpha'), but not things like degrees C. Having googled 
it, I got textcomp.sty from:
http://www.texnik.de/symbols/textcomp.phtml

but have no idea what to do with it. What's an .sty file anyway? Any 
pointers please?

Cheers,

Dave
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David Wolfson
Institue of Biomechanics,
Univeristy of Nottingham

e-mail:eaxdrw at nottingham.ac.uk
tel:0115 95 13277