Step 1: Open SmartThings app and go to "My home" page to add a new device.
Step 2: Find "meross" application and open it.
Step 3: Choose either icon to proceed in below step.
Steps 4: Authorize your meross account as below.
Steps 5: Allow the permissions in below step and then go back to "My home" page.
Step 6: All the meross devices configured under the authorized account will show up, you can assign proper room for them.
Step 7: Congratulations! You can control your meross devices within SmartThings app now.