You need VIP membership to do most things on the board, including seeing the hobbyist reviews, which is all that you can look up on non-providers

Which search tab or link are you trying to use? What type of information are you hoping to enter as the key information for a search?

Even without VIP you can do limited searching of Reviews and Providers as well as searching discussion boards.

If you hit "Reviews" then "Search Reviews" you have a choice to search by provider or hobbyist, but you need either the exact name of TER ID.