Usually successful websites have:
•URL (addy in address bar)
•Title of article or particular page (not URL)
•Subtitle of the above (usually includes Intro)
•Text or main body
The reason for stating this is .... >> you can change the Title, Subtitle and Text in the main body, including fonts, colors, pictures, and layout, BUT not the URL. However IF you buy a URL domain and re-direct it to the place where you actually write and where the content is - then this is possible.
Also you would have to check the guidelines for where you write currently, because they may not even allow you to change the font size OF the Title, and Subtitle (if pre-set), but they should certainly let you change the name of it. Also they may not allow re-directs OR have certain criteria for re-directs. That would be part of your research before you try and make changes. For now, just change what you can.
That's the short answer, but the long answer would take too much space.