DPL is an extension that can only be enabled by full-time staff for Fandom wikis, so the process may differ somewhat from what you have been reading elsewhere. I can get someone to enable it for this wiki, but before I do, I want to make sure you have read the Fandom-specific help article on this topic, Help:DynamicPageList, to make sure that you are fully aware of its complexity and the potential negative side effects. If you've already read that article and are still interested in moving forward with it, give me another poke here and I will get in touch with someone to enable it. 🙂 - Sitb(Message wall / Talk page) 09:48, February 21, 2020 (UTC)
Discussions are (mostly) a replacement for the old forums system, which is no longer receiving updates. The code that it runs on is outdated and just isn't sustainable anymore. In fact, with the implementation of the United Community Platform soon, forums are likely to disappear entirely, and their content migrated into an entirely new system, which may or may not be similar to discussions. We (outside of the full-time Fandom staff members) don't actually know what that's going to look like yet.
However at the moment, you can still access the forum relatively easily through the wiki's top navigation (under "Explore>Forum"). - Sitb(Message wall / Talk page) 09:47, February 20, 2020 (UTC)