Reset password for virtual box vm on Windows 10

I have installed Home assistant on my Windows 10 via virtual box. It all works and i have set up devices and dashboard to my needs. Issue is that when i installed VM I took it as experiment and typed some password that came to my head at that point, not thinking that i will actually keep this vm and build my home assistant.
Now, i am unable to access files of the vm because i cant remember password.

I am able to access home assistant and ssh console plugin there, but unable to ssh/ftp to VM itself using some other tools.

Anyone knows how I could reset password?

Does this help

Short of that, Perform a full HA backup, rebuild the HA VM, and then restore the backup.

Thanks ServiceXp, this sounds like something that could work. I will give a try in couple of days.