I think the standard thing to do would be to include a disclaimer in your profile, something to the effect of:
Anything I say here that sounds like advice on aircraft operation is obviously very general. You should always consider your own situation, remember your training, and fly the airplane!
(stolen, more or less, from the UCAP disclaimer)
Another good one is
Though I am a CFI I am not YOUR CFI. My posts here represent my own opinion, and not those of my employer or the FAA. You should consult your CFI and aircraft operating handbook for specific information and instructional guidance.
(made up on the fly, and I'm not a lawyer -- may the force not sue me and such.)
If you're a member of AOPA and forking over for their legal services plan it may be worth a 20 minute phone call with one of their lawyers to come up with language that an aviation lawyer thinks is at least mostly bulletproof, but generally such disclaimers can stand well enough with "common sense" language.