Changing ringtones and volume

How can I change the ringtone and volume on my Wireless Video Doorbell (Battery-Powered) with 2K HD?
I am very happy with my new doorbell, but I do not like the ringtone and would like to replace it for a more pleasant sounding one.

Press the gear icon in the app for the doorbell, then select ‘Indoor Chime’, select ‘HomeBase as chime’ and select the one you want