If you mean SUBMITTED 2 days ago but not yet approved, I think you just

Go to "My TER".  
Click on "My Reviews".  
The big blue button should say EDIT as long as Status is not yet Approved.

Once approved, the blue button changes to VIEW.

 
If the review has already been approved but you made a minor mistake, I think you just "Contact Us" TER Admin and ask them to allow the change or make the change for you.  (E.g., something easy, like you included your tip in the price instead of just the basic fee or you picked the wrong city from the Drop Down menu.)  

If it's approved and you need to make MAJOR changes ("Yikes! I reviewed the wrong girl!") ... gee, I don't know but I guess there are several options that TER Admin can offer

If you wrote a bad review and now want to make it a good review because you are being threatened for writing it, don't expect to be allowed to change it. If you want to correct spelling or punctuation, don't worry about it. If you said uncovered but meant covered it should be an easy fix by filing a problem report.