Each page you create comes with a set of SEO options that are very useful for promoting your website. To set them up, navigate to Site Pages settings > click on the gear icon next to the page's name > SEO.
Here you can add the following meta tags: Title, Description, and Keywords:
Under the SEO tab, fill out the Title, Description, and Keywords meta tags. To apply the changes, you need to click on any space outside of the settings window and then publish your website.