Header messed up

I was trying to install “Image slider” on my blog. I went to CC editor, header and pasted the code there, but it damaged my header and now I’m unable to log into my account. This is how the header looks now: https://lifeismessyandbrilliant.com/bullet-journal-currently-watching-layout-setup/

Now, I can’t log in into my account. It just shows me a blank page and nothing loads.