I'm probably missing something obvious but for the life of me I can't out how to update the format of an existing release. Including a format in a new release is no problem.
So for example the original release of Marvin the Album by Frente (https://musicbrainz.org/release-group/ddfd1b63-7194-3387-a7f2-e658bcf199f3) has an (unknown) format. I want to change it to CD (got the CD sitting next to me as I type). Can't find where to do that.