Open the thread that you want to unsubscribe from and click on the the tab that says "thread tools". In that menu, there should be an "unsubscribe" button.
If you would like to subscribe again to that thread, simply post in it again or click the "subscribe" button in the thread tools menu.
2017 Jay Feather 7 22BHM Baja/Andersen WD
2018 F150 4x4 3.5L Ecoboost Max Tow
2015 MB Sprinter 2500 Passenger 2.1L Diesel
2007 Ram 2500 4x4 Cummins 5.9L G56