Note: This new F-Secure KEY autofill feature to log in to apps is available only on devices running on Android Oreo (8.0 and 8.1). For the websites, the autofill feature is available only on devices running on Android Pie (9.0).
To enable the autofill feature:
On your device, go to Settings > System > Language and input > Advanced > Autofill service.
Note: Depending on your device model, the access to the Autofill service may be different from the above. Consult your device manual for more information.
Select F-Secure KEY as your service, and then select OK.
Your device is now set to allow autofilling of log-in credentials.