How can I change password for a Master Key Database?

I’d like to change the password of my existing KeePass Database. How can I do that through AuthPass?

sorry for the late response, but unfortunately this is not yet possible. Here is the relevant issue: https://github.com/authpass/authpass/issues/46

It’s been a while, but changing master password is finally implemented in AuthPass 1.9.2 - it is currently rolling out.