URL in a test CRM not correct - where can I change it?

We have “cloned” our CRM for testing purposes, but the URL address where all notifications are sent is still the one of the original CRM, and not the one of the test CRM.
I have spotted in my user profile where this is set, but I can’t change it, even if I’m administrator (see print screens in the file attached).

Could you let me know where this can be changed?
Kind regards,

your attachments have not been included,

however if you look in the config.php file there should be a section for site_url, you will need to update the url next to that.


Thank you, I’ll try this and let you know!
Kind regards,
PS: I’ve changed the file format of the attachments, it should be ok now.