Sorry, Laura doesn't know what she's talking about. The basis for instuctor licenses are that a prospective student is required to log a certain amount of
instruction time from an instructor cerified in whatever airman classification they're seeking. No such formal training requirements exist in hobby RC flying
and no regulation exists to cite to issue such a violation.

A friend and I are out flying RC. We both know how to fly but he hasn't ever used flaps. If I explain flaps, how to trim, etc., am I now an "instructor"?

RC instruction for money is another matter.