Navigate to some webpage with a payment form in your browser.
Press SafeInCloud icon on the browser’s toolbar. The extension popup will appear with a password request. Enter your password.
The extension will show a list of bank cards from the SafeInCloud database. Select one from the list.
You can also see details of each card under Show button (when the mouse is focused on an entry).
The extension will autofill the form with the selected card details.
If some card is missing from the autofill card list, make sure that it has enabled the Use for Autofill checkbox. This card must also have non-empty Number, Owner and Expires fields.
These fields should also have correct autofill attributes. They are usually assigned automatically, but you can check them by pressing the Autofill icon on the toolbar of the Edit Card window.