Logging out of old devices

Hi pattycake, if you want to sign out on all browsers:

iCloud: Use iCloud.com

If you want to remove the devices:

Go to iCloud > Settings > Manage Your Settings. Choose the devices you want to remove.

From iCloud help menu:

1. "Go to Settings on iCloud.com, then look at the My Devices section.If you don’t see the My Devices section, your account just has access to iCloud web-only features. To gain access to other iCloud features, set up iCloud on your iOS device or Mac.
2. In the list of devices, click the one you want to remove.
3. Click the Delete button "x" button next to the device. If you don’t see the Delete button, click Remove Device (below the device serial number or IMEI number).

Besides removing an iOS device or Mac from your iCloud Account, you can remove it from Find My iPhone. If you remove a device from your iCloud account, and the device reconnects to the Internet, it reappears in the My Devices section of Settings."

Settings/iCloud and sign out.