If you cannot discover the Geofilter that you created, there are a handful of ways that you can improve it's discoverability.
- Make sure you have strong cell/wifi.
- Make sure your didn't put the wrong date, address, or time.
- Make sure your phone has strong battery.
Items such as cell/wifi and battery life are important because they assist with helping Snapchat determine the exact location of you and your phone.