edited storefront-functions.php site crashed

Hi,

I wanted to remove “related products” from my products page.

After searching many articles i came to realise this could not be done by simply checking a box, i fount this article which seemed to explain everything https://docs.woocommerce.com/document/remove-related-posts-output/

I thought best top copy the contents of this file just in case, i did and saved. I applied the changes but site crashed reporting a HTTP ERROR 500

I replaced all the old code back and updated the file but same error is appearing.

im stuck here, i can click back arrow on mac to enter admin area, otherwise im frozen out.

any help would be greatly appreciated while i still have aceess.