cant change site url back to original

My wordpress address is:
https://user32709.vs.easily.co.uk

I got my hosting company to point my new web addresss: https://www.klearminds.co.uk to my website hosting. (it used to be https://www.maggiemorrow.co.uk)

I then changed my wordpress address and site address to https://www.clearminds.co.uk

when I hit save my browser brought up the following message: Firefox can’t find the server at https://www.maggiemorrow.co.ukwp-login.php.

I tried going backinto wordpress and re-entering my original wordpress address: https://user32709.vs.easily.co.uk and save, but when I click save it keeps bring up the same error:

Firefox can’t find the server at https://www.maggiemorrow.co.ukwp-login.php.

Can anybody help me please I’m not a computer expert and seem to have lost my website eeek! Many thanks.
maggie