Am I just being idiotic?

On every game page I visit (even on my own game page, Survival in the Orclands), there is a link to rate the game:

If I click it, I go back to the submission page, the title bar changed to "Rate ...", but I can't find any place where I can actually rate the game, or (in case of my own game) see its current ratings! The only thing related to rating I see is this text this in the top right:

Am I allowed to rate games? If so, how can I do it? Must I post a comment first? Or add it to my collection?

Note: Yes, I have an account, and am logged into it while trying this.