If SEO by 10Web is not installed on your WP dashboard, go to your 10Web Dashboard and enable the SEO service.
If you have set up meta information for the Page type using the correct placeholders, you, most likely, will not need to do it here. However, you may need a more advanced customization of a certain page or post, this will be the right tool to use.
From your WordPress dashboard, go to Posts or Pages. Select the post or page you want to optimize.
Scroll down to the SEO by 10Web block. Add the meta information and update the post/page to save the changes.