If you skipped a step on registration, you may have missed out on putting yourself on the Throngbook map.
MYou can repair this by making sure you've got all the details you need on your profile, including the hyper-important postcode. (Please see notes on map page if you have filled this in and aren't showing up. It's all down to the format)
There's so much detail you can add here, it pays to spend a while setting yourself up..