Question: why are other people I know allowed to do things on this forum that I can’t seem to do?
Answer: this forum software, Discourse, has developed a way of managing user capabilities (permissions) using a “trust model” where people who have “done more stuff” in the forum, like responding to posts, liking things, and other actions, are gradually rewarded for their participation by receiving increasing levels of “trust”.
Each user starts at level 0 and can progress to level 4 (so, 5 levels total).
With each increase in trust level, a given user (there should be one actual person associated with any given “user”, as dictated by their email address and password) is able to see more “controls” when working with the forum - they can do more things and take more responsibility.
The Discourse developer community offers this comprehensive view of how Discourse trust levels work.