Read the documentation at Thunderstone.
Run the administrative interface.
For technical support with Thunderstone products, visit https://www.thunderstone.com/support
The message boards there contain many useful tips; a quick search of them first may yield the answer to your problem faster than posting a message. Note that the message boards are public, so anyone can see your message. If you have a more specific, private or urgent issue, there is a form to open a tech support request instead.