The link you followed is designed to be used on an Android device where MyTrails is installed. You likely ended up here because that wasn't the case. Here's a checklist of what needs to happen in order for you to use this map configuration:

  1. Install MyTrails (version 1.3.24b7 and later only)
  2. Try the configuration again:
  3. When asked which application to open the link with, make sure to use MyTrails rather than a browser
  4. If all else fails, you can use the following link (only works on a device where MyTrails is installed): click this link