Blog, news & splash page
The search engine details applied to your content pages, meaning your blog, news and splash pages, along with how many entries are listed at a time.
Settings
Page Size - how many entries are listed on a page before the reader moves to the next one.
Page Title - the title search engines show for your content pages.
Page Description - the summary shown beneath the title in search results.
Keywords - the keywords associated with your content pages.
How to Update Your Content Page SEO
Select the store you would like to update
Click on Manage Store Settings underneath Settings
Open Marketing & Growth
Open the Blog, news & splash page section
Set the page size, title, description and keywords
Save your changes
The content pages themselves are created under Stores > Content.