Pages are renamed by moving them to new target names. This procedure preserves the page's edit history. Please do not rename a page by copying/pasting its content to a new page name. If you have an autoconfirmed account (an account that is at least four days old and has made more than 10 edits), you can move a page yourself, but please first review Wikipedia:Article titles. If you still wish to rename the page, go to it, click the Tools drop-down menu at the top on the old vector legacy look (near the View history button and Watchlist star), and choose Move. On the new vector look, simply click Move under Tools in the right margin. You can then specify a new name for the article. The old page name will automatically become a redirect to the new page. However, if it isn't possible for you or you think the move would be at all controversial you should request the move on the talk page using the Template:Requested move. Even where a move is uncontroversial, if the desired target page name already exists and is other than a redirect with only one edit, you will need an administrator or page mover to move the page for you, which can be requested at the technical requests section of requested moves. Hope this helps.