Edited Theme Functions and entire site went down

I added the code for breadcrumbs provided by Yoast to the bottom of the “Theme Functions” editor and my entire site went down – including the WordPress back-end.

If I press back I can get back to the Theme Functions page, but nothing else. I deleted the code I added and pressed update, but it doesn’t seem to change anything so I don’t think that page is actually activated anymore.

Can someone help me???

My site is http://www.onlineroulettebetting.com

Thanks!