Yes, you need to have signed up for Avis Preferred and have the latest version of the App on your phone.
Yes. You will need to be logged into your profile to make or change reservations and process a self-service rental including exchange and/or upgrade car choice.
If you are already in Avis Preferred, make sure you are signed in. You may need to download the latest version of the App and make sure you have accepted the Terms and Conditions. If you are not in Avis Preferred, you can sign up either in the App or on the website.
You need to make a reservation at a station that is set up for Self-Serve to see the Self-Serve functionality.