Edit publisher
Renaming does not move anything: the 96 articles under this publisher and the 148 citations from them stay attached.
The mark is the circle beside the publisher's name wherever a citation names its source. The type and color reach the retailer through the implementation box on their placement pages, which is how an ad creative gets built in this publisher's brand rather than in the retailer's.
Brand imagery a creative can use behind a quote. This is the one asset V1 does not yet pass on, since the retailer builds the ad from the type and color rather than from supplied imagery.
Upload the font file alongside the name wherever you have one: a name alone renders nothing on a machine that does not have the typeface installed. Leave the file empty for a common web font the publisher cannot licence on.
Both rates start at the default. Set an override only where the rate was negotiated to something else, and the publisher detail page marks that one as an override.
A publisher can only be deleted once it has no articles, because a citation hangs off an article and an article hangs off a publisher. Delete or move those first. There is no user to notify either way: nobody at a publisher signs in during V1.