Help ASAP – Blog post editor frozen!

I was in the middle of updating this blog post (http://syriainstitute.org/2016/04/14/aprilgeneva/) with the Wednesday, 27 April 2016 entry you can see near the top of the page, when the back-end editor stopped loading. Now I just see a spinning wheel.

When this happened I had been trying to figure out how to embed a NYT iframe video into the post, and it ended up being published with this code visible: <iframe title=”New York Times Video – Embed Player” width=”480″ height=”321″ frameborder=”0″ scrolling=”no” allowfullscreen=”true” marginheight=”0″ marginwidth=”0″ id=”nyt_video_player” src=”http://graphics8.nytimes.com/video/players/offsite/index.html?videoId=100000004368867″></iframe>. I really need to get back into the editor so that I can delete the code at least, please help!

I don’t have any coding experience but I believe everything is updated and I did clear my browsing cache. The only solution I haven’t tried from your “if you are having trouble since the 4.5 update” recommendations is adding some code to the themes functions.php, because I don’t know what this means and am afraid of messing something up.