I'm happy to say that I have finally had a chance to finish fixing the scripts to let members review the filmography episodes on the site.
In the "Fan Reviews" section for each episode, you will see an "[ Add a Review ]" link in the upper right corner of the section if you haven't posted a review so far. You can only review an episode once, but if you can edit your existing review to update it, if necessary.
Please note that you no longer have to include your rating for the episode in your review, as it will automatically appear below your review (assuming that you have rated the episode.)