To leave a review for a review on an eatery you first off have to register then login and find the eatery in the directory.  Once the eatery page is open will click the Reviews Tab and "Add new Review".

The page will change slightly in format as the review form becomes available and you simply enter your text, ratings and answer the questions.  Your main review needs to be at least 200 characters long.  You will need to enter the random letter/image shown in the form before you click submit (this is an anti spam bot feature)