Made mistake in corosync.conf; now cannot edit

I have (had) a 3 node Proxmox VE 6.2-11 and Ceph cluster. I'm modifying my config after install and some light use. Ceph is now on its own 10Gx2 LAN. I decided to dedicate a 1Gb interface and create a VLAN for corosync and attempted to modify corosync.conf before understanding exactly what corosync does and how it works.

I would like to revert corosync.conf to a backup version or directly edit the file, but I cannot modify /etc/pve and when attempting to edit corosync.conf, I am...

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