To add a comment on the FCC website, the easiest way is to go to https://www.fcc.gov/ecfs/search/filings?proceedings_name=17-108&sort=date_disseminated,DESC, click on +Express in the first box in the sidebar at left, then fill in the appropriate fields. Unless you have A LOT to say, it will take you only a couple of minutes. (21 November 2017)