I assume you are talking about map reviews? AFAIK, there is no way to comment on a SP level.
This page : https://www.warzone.com/Map/7224-Modified-Medium-Earth
is for reviews of the map itself.
(I saw you made a comment there)
Also, they are sorted by helpfulness. If you look under the comment, there is Yes/No voting.
EDIT: reading thru the reviews.... a lot of players have made reviews of level there. Might be nice to make it clear what you are doing. And would also be nice to have level reviews I guess.
Edited 2/19/2020 18:46:10