Lightbox plugin partially broke my site

I just installed the free version of Lightbox pop-up. I filled in the information and it worked. I did wanted to add more to what the box said, so I went in and changed the information. I added a link and some graphics to the field.

I am using WordPress from Yahoo Web Hosting. I had added in the PHP code into the index.php file so that people only had to type in williamedwards.us to get to the site. This had been working all along. Now this gives me an error that says, “Proudly powered by WordPress | Theme by John Loan”. I can still get to the site by typing williamedwards.us/blog. The index.php file is still the same, so I am wondering what I need to do to fix this. I deleted the plug-in and it still doesn’t work.

The website is: William Edwards.

Thanks in advance for any help.