The Pins feature allows you to save and follow different threads on Jodel. Press the pin icon in the top right corner of a selected Jodel. You will receive push notifications on any updates to your pinned Jodels. The saved message will be visible in the "My Pins" section when you tap:
iOS: Profile icon in the bottom right corner -> Settings icon at the top left -> My Pins
Android: MY KARMA -> My Pins