To find your listing, just enter your phone number (the one you put in the listing) or your listing code in the “Free text search” and click “Search”. If the listing you have placed is for free, you will be able to locate it 15 minutes after it has been published by searching as if you were a buyer.
If your listing was already active and you’d made some changes to it like adding photos or changing the price, the listing will be reviewed again, and it will take a while to be displayed in search results.