I'm sorry if this is a silly question, but how do you rate? I've been told this is important and helps.
If you're asking then you're probably on mobile. I've found that you can't rate itch.io games on mobile for some reason. If your on mobile chrome which is what I use. There should be three circles in the top right corner. Tap that and scroll until you see "Desktop site". Once you tap that, the page you're on should reload and be slightly changed. Then you'll see "Rate this game" in the top right corner of the page. From there you don't need me to tell you what to. To reverse the changes you just do what you did before.