From here on out I ignore width comments

Step one: go to "My Account" link on the left hand part of the website, where the other links are.

Step two: The third icon over reads, "Select Theme", click on it.

Step three: From the dropdown menu, you may override the current theme, and return to the old theme, which is called "PostNuke". Click save changes and all your width problems will go away.

Step Four: If the HTML had been posted correctly, then the code would have wrapped around like it should have, and would be no width problems.

Step Five: Make your own blog site with whatever width you like!