How to transclude a page into the page you are editing
Including the contents of one page ("the template") into a host page is called transclusion. This allows the host page to automatically be updated whenever the template page is updated. It is accomplished on Wikipedia by surrounding the name of the page from which the contents are being transcluded with two pairs of curly brackets and leaving out the "Template:" prefix. In addition, pages in the following namespaces can also be transcluded: Category:, Help:, Portal:, User:, and Wikipedia:. The only difference is that you must include the prefix (followed by a colon) with the page's name inside the double curly brackets. Images can also be transcluded, but this is done using double square brackets instead of curly ones. Here are some examples of templates that will transclude if you paste them, save them, and then refresh or purge the page:
... that, after future Blue Devils player Nate Sheppard broke his leg during a high school football game, he hopped for 40 yards (37m) on the other leg?
... that in Nathan's parable, the prophet got King David to sentence himself by telling him about a rich man who stole a poor man's only lamb?
... that BohemondV's attempts to avenge his brother's murder threatened the interests of the Catholic Church?
... that Yu-Gi-Oh!: The Abridged Series was renamed Yu-Gi-Oh!: The Cancelled Series because of its numerous copyright issues?