Hi! I’ve been browsing various Blizzard forums and I came across some threads that present info on text formatting and trust levels, which I thought it may be helpful to you.
The trust levels requirements may be different from the other forums. The Hearthstone thread shows you how to see your own trust level.
Although the content is mostly similar, you should check both links, as they contain some extra info.
https://eu.forums.blizzard.com/en/hearthstone/t/the-ultimate-forum-guide-codes-trust-levels-faq/35/