Social Icon broke entire site need help!!!!!

I followed your video on how to setup Social Icons step by step. When I got to the step where I selected “Open link in new tab” and clicked save it took down my whole site. Now I get an error saying “ERR_CONNECTION_TIMED_OUT” for both front end and admin areas.

I just got this up and running and have spent all day customizing the site so please tell me all is not lost and there is a way to undo this and get the site back up and running.