I broke my wordpress site

hello everyone!

I really need help asap!

I can’t get login access to my website anymore: itsnotjustlyme.com/wp-login.php

everything is messed up, including the website itself: itsnotjustlyme.com

– it’s just a blank page now.

I need some sort of reset or something…

what happened was that I entered jquery script into the jetpack.php editor and now I broke everything. I can’t get into dashboard to undo my unholy f**k up…

How do I get my site back up / how do I get back into the codes to undo what i’ve messed up if I can’t even login?