Change pagination

Hi!

I noticed that under the posts on the first page of the Arcane demo site (live preview), there’s an “OLDER POSTS” button that when pressed loads more posts to the list. But on my webpage there is instead a list of numbers and arrows to next page…how can I change this to match the way it works on the demo page?

I get a lot of duplicate content (meta and such) warnings from google because of the multiple pages of the first page and the categories. I think this is all because of pagination, but I can’t find a way to change it anywhere.

Thanks in advance!