I'll explain:
1. click on the "Site Reviews" tab at the top of the page (as previously stated).
2. click on "Reviews by Service type" (as previously stated).
3. on the drop down menu scroll down to "Escort Agencies" and click (as previously stated).
4. select a city and click "Go". If you don't click "Go" you will be taken to Escort Agencies page anyway.
5. Look across to the right for the percentage next to the "Thumbs up" symbol (since the percentage is in teal colored font it is a link) and click on the percentage number.
6. read the comments left by hobbyists about their experience with the agency.
7. click on the "rate this site" button (upper right) to enter your comments if you like.

This appears to have been intended more for rating the site but as you can see many of the comments are about the agency and the experience. Read carefully, sometimes I have found an agency listed twice one with glowing comments and the other not so much. There is a search feature so you can look for a specific agency.