I am using the Relay Theme and added the query loop block on a Blog page so I can display my blog posts in a nice format.
The blog page only shows 8 posts. I figured that once a 9th and 10th post would be added, it would automatically add those to a 2nd and 3rd page, and so on.
if you’re using the Query Loop block, then select that block in the editor, and in the Blocks Toolbar there will be an option to insert the Paging Navigation. This will allow users to select that various pages.