getting a plugin to work

Hi there. I haven’t changed a thing to any part of my website yet the audio page’s xspf player no longer displays. It did before, and worked perfectly. It shows correctly in the management section of WP.

I believe this could have something to do with the way my ‘page edit’ or ‘write page’ screens are being displayed. They’re showing the total preview of how things will appear once published. Previously, it displayed the basic text including tags and code.

I have tried going to my WP option and toggling on and off a few options but I can’t seem to revert back to a simple view rather than the rich preview. My options seem to have no effect.

Any help would be appreciated. Thanks.