If you are hoping to have Intervals run completely under your domain, unfortunately that is not possible at this time. If you would like more details, here is more information about why CNAME’s are not supported:
There are two alternatives that rely on redirection or the HTML Frameset tag. One option is to use an htaccess redirect on your server. The other is to use the FRAMESET from HTML. These may or may not achieve your end goal but we’re mentioning them in case it helps.