Once you're logged in to Google Home app, here are the steps.
1. Under home control select Samsung Smart door lock
2. Link your Google home to Samsung door lock, log in with your Samsung Door Lock ID and Password
3. Select a door lock, select A30
4. Go back to Google home screen, you will see the A30 under "Linked to you"
To move the device to a different room
1. Select A30 doorlock, under Device settings, select Home "add to home" then Next
2. Select a different room to move the device.