Hi,
Limiting the number of displayed post per page is set through Dashboard > Settings > Reading and set the Blog pages show at most to 6.
As for pagination, pages should automatically appear if you have more than 6 posts when you set the limit to 6 if you’re not using infinite scroll.
If the number of total posts is less than the post display limit, it makes sense that there’s no pagination because there’s no more post to put on the next page.