and an accompanying profile page.   The ID number will be at the top of that page.

 
The Instruction Manual that is linked on this page has all the rules for posting ads.   You may want to get a friend to translate for you.

You can participate on the discussion board(s) for the area(s) you visit so people get to know you. And you can ask more local-only questions.
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You can post an ad, once every seven days, on your local AD board.
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You can post a photo, once per day, to the Photo Only board.  
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If you have questions about any of that, or more, post more Qs here.
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And when you REPLY to someone else's post, you can include a link (URL) to your ad.