If you have already JIRA OnDemand instance, just subscribe for Confluence in OnDemand via MAC (https://my.atlassian.com) to add it to your current JIRA OnDemand.
Finally, I hope the below link might be helpful to you.
Let me know if you need further help.
I also am a newly registered user for a trial of onDemand confluance + jira + calendar. I received a mail to access jira, everything just works fine there but I received no news concerning confluence and it seems I can't access the service. Is there a way to check if the request for confluence was properly registred? (My Account says it is). Where can I start the serivce?
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