- Login to your online account.
- Click on your name on the header section and on My Account.
- Then click on Security.
You can see the list of all the devices allowed to connect to your account and the hour of the last connection for each.
You can disapprove a device by clicking on Delete.
If you try afterwards to login to your online account using this device, you will be request to approve the device by entering the security code you have received by SMS.