Depending on when your domain name was registered, you have a few options for making adjustments to it:
Within 24 Hours of Signing Up
Rockaway Hosting offers a 24 Hour No Regrets Policy allowing you to request a different domain name for any reason within the first 24 hours of signup. Perhaps you left a typo in there or suddenly deciding to go in a different direction, no matter the reason we can take care of it. To take advantage of this send a message to firstname.lastname@example.org with the domain name you would like and we'll modify the account for you.
After 24 Hours of Signing Up
If you wish to modify your domain name and it has been more than a day since signing up, you can request a new domain for the cost of a single domain registration, $15. This is done by logging into your Client Area portal and clicking 'Domains' and 'Register a New Domain.'
Rockaway Hosting will swap it into your account and you won't lose any of the work you've done up until that point.
Editing your URL
We have a documentation article on changing your WordPress URL here.