There are many plugin which allows you to display related blog posts in WordPress. This tutorial is on a different kind of related posts plugin which allows you to select the taxonomy type and it shows related posts only from that particular taxonomy given by you. With this plugin you can set related posts display by taxonomies like tags, categories and other custom taxonomies created by you.
Using new I-Agree (BETA Release) WordPress plugin you can add custom text, links etc like terms and conditions which needs to be ticked before to make login from WordPress login screen. The plugin text is customizable, you can add all text there on login box or create a new Terms & Conditions page, copy its link and add there as shown in the following screenshot.
Now by using new WordPress plugin by Juan Viñas you can create terms definitions and use them inside your posts and pages for displaying the definition of terms via jQuery.