We don't have a screencast to show this, but basically you highlight a section on the left, then select the mistake type, type in the corrected version and optionally add some notes.
Rankings are applied as soon as you submit them, but the correctors aren't notified of this. This helps keep it anonymous, which typically makes people more likely to submit ratings.
Rankings are applied as soon as you submit them, but the correctors aren't notified of this. This helps keep it anonymous, which typically makes people more likely to submit ratings.