The good news is that this means you've set up everything correctly: the domain name is correct in LaunchKit, and the LaunchKit CNAME is correct for your domain. Great work!
If you still don't see the page, this 99% of the time means your computer is accessing an old version of your domain's DNS settings. This usually resolves itself within 24 hours, but a way to test this is use someone else's computer and see if the website still isn't showing up.
For complete instructions on how to set up your custom domain, see the writeup on the LaunchKit blog.