Unfortunately I don't think you can use Remote Links with OnDemand because Application Links are one of the restricted functions (http://confluence.atlassian.com/display/AOD/Restricted+Functions+in+Atlassian+OnDemand#RestrictedFunctionsinAtlassianOnDemand-JIRA) that you're not able to configure.
Though it might be worth using the "Poke Atlassian" button on this question to get an official response and/or log a support ticket in the OnDemand project at http://support.atlassian.com
Hope that helps?
Badges are a great way to show off community activity, whether you’re a newbie or a Champion.Learn more
Connect with like-minded Atlassian users at free events near you!Find a group
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no AUG chapters near you at the moment.Start an AUG