Hello
I’m logged in to start9.
Now I want to change my password, but I don’t remember the current one 
What do I need to do? How do I proceed?
The process for recovering from a lost password is detailed in out documentation:
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and how can I flash the latest version of StartOS, if I have Start9 in a VM in proxmox?
The same way you did it the first time. You may want to refer to Proxmox documentation.