seeking help to open my website

I am not able to login to my wordpress website dashboard.
seeking help to open the same
site as – a2zparenting.com
I was trying to change in setting as adding www to my site address. I entered the same admin general setting and after clicking on save for the same than it was auto logged out and after that I am unable to log-in.
Looking for your early and positive revert for the same. Kindly do the needful at the earliest.
Thanking you.
Regards,

The page I need help with: [log in to see the link]