My article are not showing up

I am posting my articles on the “page” area of wp. I have posted 4 articles and only 2 of the 4 are showing up. For the other 2 I am receiving a message “not found”.

How can I fix this problem?

Here is my url so that you can take a look at it. http:womenbodybuildingonline.com

your help is greatly appreciated.