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I explained how to find parts on the game page for someone else a couple of days ago for another game; here's the relevant part:
Note that BGG has a method for listing this info where it's easier to find; threads like this tend to fall into the heap after awhile and become hard to find.
It's very easy to enter your info. On the game page, scroll down to the User Information (use Add a Copy if you haven't already done so) and fill in the Want Parts and Has Parts sections with the appropriate info. Once you've done that, people will be able to see it in the Statistics section by clicking the numbers next to Has Parts for Trade and Want Parts in Trade.
In this case, I see 25 listings under Has Parts for Trade for Stratego.