http://www.helloyujia.com
Thanks for your reply.
My goal is to cancel the template on the front page.
I know how to set up a page as a front-page in word press. settings-reading-static page. However, the demo front page always automatically replaces the page I want. For example, I want the photography page to be the front page once I click my website. But the demo will show up instead. In the beginning, I can set any page I want as the front page. But one time I accidentally clicked import demo. Then my own frontpage replaces by the demo front page and I can not find how to cancel it. I added a header video on my front page for now. Also disabled all the widgets like portfolio, posts, and others. If I remove the video, it will be a big dark space. The demo remains there.