Good ole mass media, telling you something big is going down, and giving you absolutely no clue as to how to get involved.
The FCC has made the comment process extremely difficult to navigate, but it looks like the hearing is on docket 23-293 (commenters, please correct me if I'm wrong). You should be able use the form here to place a comment on the proceeding. Use 23-293 in the proceedings field to bring it up for selection.
Here's a more detailed view of the Media and Democracy Project's petition, which includes a supporting filing from Jamie Kellner, former president of Fox Broadcasting.