Is your article too long or the post would be better if it was broken into multiple pages? The ability to paginate a post is a functionality that is built into WordPress. You could split a post/page up into different web pages so that is has pagination.
All you have to do is the following:
1) Switch to TEXT mode (not Visual). This it the tab on the top right side of the post body.
2) Type the following into the exact area you want to split the post into another page. <!--nextpage--> 3) Save. That’s it!