When I then tried to set type in rossyvolley.com to URL bar (after setting it as primary domain) the page does not load and said 'the requested URL could not be retrieved'??
I am seeing http://rossyvolley.com/ point correctly to your WordPress.com site.
It can take 24-48 hours for domain/DNS changes to propagate throughout the internet. It typically happens faster than that, but it really depends on your ISPs update frequency. If you are still not seeing the correct site appear after 48 hours has elapsed, please contact me again.
Also, do let me know if you have further questions or if anything is unclear.