One of the first steps in setting up your community will be the banner settings, which can be found under the “Appearance” menu in your Vanilla Forums Dashboard. These settings allow you to add SEO elements, such as a homepage title and description, that will appear in search engine results.
Please note, this information only applies to the homepage. Individual posts will have the data taken from the discussion titles in your community, and the description will be taken from the content. This is just one of the ways Vanilla does the SEO for you.