Next to the name of your page there is an "Edit" button and has a an arrow next to the word edit, click the arrow and a drop down menu will come up, then just click "Rename" or "Move." The "Move" link will take to a page where you can change the title.
Click on "rephrase question" link right next to the question in the blue bubble where the question in shown on wikianswers
On Wikia, click on the "move" link in the toolbar at the top of each page.
You must be logged in to move a page.
See Help:Moving pages.
For Wikia help: