New here--what did I do wrong?

I joined after years of reading the tropes pages (but never having used the forum) because of one specific issue that interests me. But the thread was locked without any attempt at explaining what I did wrong. Is there a specific forum area where the question would be more appropriate?

https://tvtropes.org/pmwiki/posts.php?discussion=16139875700A57933500&page=1#2

Trope Finder is the place where you ask for what trope you're looking for. This is to keep things organized and in the proper places.

In the same forum, there's a pinned post explaining this.