truenas cannot start properly when centos7 is installed

I then installed centos7 in truenas scale virtualization. After the installation, I clicked Restart and returned to the centos7 installation interface, but the centos7 that had been installed could not be started normally.
How do I run my installed linux.

did you remove the cdrom device from the VM to stop centos from running the install again.

No. This is the first time for me to use truenas and I don’t know what to do. Could you please teach me how to do it

I found a place to delete the cd-rom. Thank you.
In addition, can you teach me free, unlimited bandwidth ipv4 penetration.
Or is there any program that I can use to find information on my own.
Thank you!