so... you say you have built a full website... is it with wordpress? if so all you have to do is go to manage domains add blank.com to be fully hosted. then via ftp or shell rename the folder blank.com to temp.blank.com and rename blank.blank.com to blank.com. before you do that though be sure to log into your wp admin and change general setting site url and the other one forget what its called to blank.com since i'm assuming the information would be blank.blank.com. you will not be able to access your wp information until you finish renaming the directory once you do it.