Hello,
Oh no! Let’s try and get your site back up if you haven’t already. First off, do you have FTP access or are you able to edit your theme’s functions.php file? If so, you’ll need to remove the lines of code you added, then save your changes. Once that’s done, your site should come back up.
We’ll start there and if you need any additional assistance, please let me know. If you get your site back up and running, please paste the contents of your theme’s functions.php file into Pastebin and share a link with me.
Thank you for your patience and have a great evening. Cheers!