To use any of the services STN-Trading offers you need to sign through Steam.
Don't worry, we don't get your personal data - just your SteamID.
These informations are designed to help you with the site and to self-diagnose problems yourself.
If you are new to the site you should start reading Getting Started, otherwise if you have a problem you can browse everything and check the articles, which might help you.
For the case you still haven't figured out to solve the issue, contact us using the Support Chat or Support Forum.