SmartThings hosts the official PlantLink-SmartThings installation instructions here:
If you encounter trouble, and the new Sensor does not appear in your myPlantLink dashboard soon, then try removing and adding your sensor again. Make sure that you mark your Sensors inside SmartThings to connect them to your myPlantLink account.
Note: PlantLink is compatible with and has an app in the US SmartThings store, however the international/UK SmartThings product/app store are different, and we are not compatible with SmartThings' international version.
If this didn't help solve the issue, please click on the Support tab to the right or email us at firstname.lastname@example.org.