Hi and welcome!
For Hermes, read this thread first:
http://forum.purseblog.com/authenti...-posting-in-the-hermes-at-section-412063.html
Only one authentication thread is active for each brand, so you do not start a new thread, but instead add to the existing one by replying to it. Here's a link to the thread:
http://forum.purseblog.com/authenticate-this-hermes/authenticate-this-hermes-bag-412022-34.html
You can do this 2 ways:
1. click on the "Post Reply" button in the top left corner once you're in thread
OR
2. go to the last page of the authentication thread and scroll to the bottom and post your question/auction link in the quick reply box.
If you need to attach pictures, click the "go advanced" button and use the Manage attachments button to upload and attach them.
Good luck!