Changing the pagination style within a blog post

Hi again,
So I’m trying to change the pagination Enfold has as default (the 1, 2, 3, page bar. Screenshot below).

I’m adding <!–nextpage–> into the text section in order to define the pages within the blog post.

I have downloaded two external plugins: Wp Page Navi and Easy WP Page navigation. With both I cannot find the appropriate code to replace in the php files (index.php).

I feel that the answer is going to be very obvious, but I am completely stumped and have been for some time. Any help would be greatly appreciated.

Thanks!
J