Users who are at Trust Level 0, won’t be able to create a new topic until you reach Trust Level 1. For more information about Trust Levels and how to advance, see this topic:
https://forums.flightsimulator.com/t/trust-levels-and-how-to-advance/121729
You are currently at Trust Level 1. Assure you are in a subcategory and not the root category. Being in the root category will not not display the “New Topic” button. If you still are not able post, send a DM to @moderators
World Updates are found in the in-game marketplace.