Nice, try! I see you are a new on SN, here below a step-by-step guide:

1. From https://Stacker.New/r/AG homepage select the https://stacker.news/~AGORA/r/AG from the dropdown in the top left, where it says home
2. Once inside the https://stacker.news/~AGORA/r/AG territory, click the big yellow https://stacker.news/post/r/AG button
3. From there, click the orange https://stacker.news/post?type=discussion button
4. You are now on the right place to post your Ad-post type: copy your ad above and paste it in the description. Make sure the title include the https://w3.do/b_v2wutP tag, item name, price and location
5. When done, click the orange button https://w3.do/b_v2wutP in the bottom right of the screen
6. Et Voila! you should now be able to see your Ad listed in the https://stacker.news/~AGORA/recent/r/AG