1. First, log in to your account then navigate to the Product you want to set up, and then click "Go to product".
2. Next, click the settings icon at the top right portion of the page.
3. Click the "Community Settings" tab.
4. To add a new Topic, hover your mouse over the blue circle icon with the "+" symbol then click "+ Add new Category".
5. You can now add the Category name.
6. Once done, click the "Submit" button. This will now be added to your categories list.
You can use the new topic in your Announcements. To know more about how you can set up announcements please click here.