I had the same question. According to Seeed Technical Support, you start a level 0, and need to browse Seeed forums until you get promoted to level 1.
Once you reach level 1, you will be able to post a topic. That’s the “basic” badge:
“Thanks for sticking around and reading a few topics to learn what our community is about. New user restrictions have been lifted; you’ve been granted all essential community abilities, such as personal messaging, flagging, wiki editing, and the ability to post multiple images and links.”
You will then see a new button “+New Topic”