How can I reach my blog ?
Go to your launchpad, edit your blog and fill the domain part.
Then, grab your local geek and point your current domain name to www.rocketblogging.com (CNAME record).
How can I theme my blog ?
Here you will find a
sample package
for a theme called "novelys" that will help you create your own theme.
Go to your launchpad, edit your blog and upload your theme.