Add a “Next Post” & “Previous Post” styled button manually to a post
This is standard WordPress functionality, contained in previous_post_link and next_post_link. You don’t need to edit functions.php. Just add to your template: <div class=”buttons”> <span class=”previous-button”><?php previous_post_link() ?></span> <span class=”next-button”><?php next_post_link() ?></span> </div> Now you can style the buttons with css. Follow the codex links for customizing options to the functions.