Okay. The evaporative emissions control system has many components, such as the check valve and the evaporative cannister. Any of these might have a leak or a leaking hose. Usually a repair shop has a tester that pressurizes the entire system and then identifies that there is a leak that way.
As for isolating the source of the leak by some other means, that's hard to advise. It could be anywhere, given the generic nature of the code.
If you are ambitious, you might check for a workshop manual at the public library, or see if they subscribe to the ALLDATA database, and get further information there. But testing the system properly usually requires special tools.
Again, check the gas cap (or even replace it if it's not too expensive) and if you had a manual, you could at least tighten up some vacuum lines in the system, once you knew where to look.