URL change question BEFORE I mess up!

Hi all,

Ok I have this site – http://dramaforthesoul.net/

I also have http://dramaforthesoul.com redirected to the url above.

I want to change, in the settings section of my dashboard the url of the blog so that it appears as http://www.dramaforthesoul.com

If I make that change will all be fine or will I find myself locked out of my dashboard?

Thanks in advance.

Jamie.