I want to know how can i delete VM which is created in Proxmox.
The remove button is on the top right next to Start, Shutdown, Stop, Reset buttons where you also enter the VNC console view.
If you're in the VM's hardware list this can be a little confusing currently as then you have a Remove button for for the virtual hardware, but that's not the one.
Also how can I change admin port 8006 to other customized port
This is not currently supported. This may cause problems with some user space tools which make use of this service.
However, if you know your way around iptalbes you might be able to block the default port for
external requests and redirect another port to 8006, but take care not to lock yourself out of your system if you try this.
You should make sure port 8006 at least works locally and if you have a cluster, cluster nodes should also be able to use this port.
But for remote access to the web interface port redirection might work.
But again, this is not officially supported.
Even i was thinking to disable root user and create new user for root i think it will be good security.
If you do this make sure you have some way to revert this change. While the PVE services don't necessarily depend on the
name root, there are still a bunch of user-
id checks around (also in other tools we make use of).
So if your plan is to only give root a different
name, you
might be okay, but I cannot make any promises, as this can also confuse parts in other packages.
I would strongly encourage you to post your results here, though.