Sample page – Cannot find it, may not delete it.

My sample page is from an old theme I used but I have since then changed. When I go into pages there is no sample page there. When I view my page http://www.wikisophie.se whilst being logged in, it looks great. But when I log out and look at my page, I only have a sample page. What may I do? I cannot find this sample page when I am logged in and when being logged in and viewing, it all looks great with my home page and the four other pages I have created in a different theme than the one displaying as the sample page.

I would kindly appreciate help. I have tried to change in reading configurations as to what page should show up first but it doesn’t help.

Thank you in advance,
Sophie.