Editing a user note is currently done via the user's profile page (in the More dropdown). I just tagged you as "Photon Dev" and now whenever I see your username, that will be diplayed alongside. So, now I see this in this community:
Currently, user notes are not exposed to the api (there is a codeberg issue for this iirc) and they don't offer a way to customize the colors (I don't think there is a codeberg issue for this one). You could use custom css to style user notes since they have the css class of user_flair.
On the topic of NWSL benefiting from World Cup viewership, I can at least offer my anecdotal story. I have been a long-time fan of the sport and watched tons of (mostly) La Liga back when I was in grad school (early 2010's). However, since then, I haven't had much time/access to watch.
I picked up a YouTube TV sub to watch the world cup and decided to just stick with it for now. Originally, my intention was to keep up with the Revs/MLS, but found that the NWSL is actually way more available to watch compared to the MLS since I don't have an Apple TV subscription as well.