This is probably obvious, but I figure it is easier to just ask. Upvoting and downvoting comments is obvious, but, at least for me, the top-level post itself has only an upvote option available. I see such posts with downvotes all the time, so it must be possible. Granted, I rarely want to down vote a main post, but sometimes it is necessary. Most recently, a popular post near the top was talking about voting in 2022. I wanted to downvote, because voting in a rigged election is absolutely foolish and does nothing but legitimize the farce. As long as the pretender remains enthroned, we live under an illegitimate, illegal occupation where our voting rights effectively ceased to exist. Such misleading lullabies which threaten to put people back to sleep should be shunned and downvoted. Unfortunately, I only see an upvote option. Frustrating!

Anyway, thanks for answering a probably stupid question that I should be able to figure out for myself xD