Glad you found it Rich.
For others, the App is called Tapatalk. It's an online forum reader. We have the plug-in for Tapatalk added to the forum and this is what allows a person to read the forum using Tapatalk. That said, the forum software is very mobile responsive on its own. As such, Tapatalk isn't required unless it's a reader you prefer to use.
Here are links to the app:
- Android:
Link
- iOS:
Link