Adding www prefix to the front of my domain

[Dokinator]

I have recently created a photography website http://3xposure.co.uk but would like the address to have the www prefix so it looks more like

http://www.3xposure.co.uk

.

The website is running on wordpress and if I change the web address URL under settings>General it breaks the website so have been going back into the php database to restore this option.

Can anyone please advise. Thankyou

 

[Dokinator]

okay, anyone else have a clue? cheers anyway touch

 

[Dokinator]

Ive had a look on the web for the whole of this evening and cannot seem to find the right answer. I did find earlier that i have the option to change from domain.co.uk to www.domain.co.uk in the domain settings but it then throws the wordpress site out