Wordepress Conversion Page Issue

Hi!

So a couple months ago I had my website converted to a wordpress based site by someone I hired off elance. The job was fine but even with my relative knowledge of editing webpages and code for my clients I am having a large issue editing the pages that were created. I just want to add/edit some text on the pages, but I can not find anything and when I click on pages in the editor, everything is blank, both text and visual.

For example:

http://postimg.org/image/6glkp65dj

Even though there is blatantly content on the page.

Can someone point me in the right direction on how I can add/edit these pages? I see how to edit images and such in the media, but not pages.

I appreciate any help! Thank you!!