From any device currently linked to your account, go to Settings.
- On a Desktop (Mac or Windows), click the dropdown arrow to open the menu, then click Settings -> Active Devices.
- On a mobile device like iOS or Android, tap the menu symbol on the upper left, then click Settings -> Active Devices.
From here, you'll see a list of devices activated on your account.
From this menu you're able to click the "X" next to any device to remove it from your account.
Once you remove a device from your account, if you want to use it again, you will need to logout and then use the “Reset Your Device” option to be able to send and receive messages again.