General: Reorder Posts Pages
These steps require that you have the Intuitive Custom Post Order plugin installed and active.
Intuitive Custom Post Order may not work for all post types, ie. "Slides" - if a post type isn't sortable after installing this plugin, try the Post Type Order plugin instead.
After the plugin is active on your site goto Settings -> Intuitive CPO and check off all the items you want to be able to sort.
Using Intuitive Custom Post Order
Once this plugin is installed and setup you can goto your Posts / Page listing in your WordPress admin and simply drag and drop your items in the desired order.
See the video below to see this in action: