How to use a live USB system to rescue my installation?

I want to use a live USB iso of FreeBSD to mount my actual system ans change a config file.

My problem is, I can't mount it because I get an error thay says that the filesystem is "read only" (reffing to the ISO filesystem).

Is there another way to do it? Can I make the filesystem read-write?
 
Create a mount point under /tmp/, mount the file system there. /tmp is a tmpfs and rw.

EDIT: This should work on /mnt as well, which is part of " / " (ro).
 
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