User can decide how many posts he wants to display on per page. It is very easy for him to select post per page.
postperpage

Here some steps are given follow and apply post per page in pagination :-

Step 1 First of all go and click on Manage Templates menu of WP Post Pro Plugin, a new window will appear with list of all templates.
Step 2 Choose one of them for applying changes in post listing and click on Edit link.
Step 3Scroll down on Pagination Settings section and tick on Apply Pagination.
Step 4 Now select the Pagination Style and tick on Pagination and give the number of posts to display on per page in Posts Per Page.
Step 5 At last click on Save Templates button for applying changes in post listing.

postperpage

As shown only two posts were selected so only two posts are displaying on per page.

Video Tutorial