Help ASAP- completely lost site – added some code to functions.php

Hi,
Please can someone help! I took a copy of the functions file before adding the code, but even when I reuploaded it the error stayed – just giving a different line number.

You can see the error message here: https://www.flaneur.me.uk

I added some code from this page to try and achieve something –
https://editflow.org/2011/01/29/filtering-custom-statuses-by-role/

now I just want the site back!

Thank you for your help ASAP!