I just found out, that due to some security concerns, OnDemand customers can not add these JIRA gadgets. This is restricted to Atlassians only. Therefore, the suggestion would be to create a support ticket through SAC (https://support.atlassian.com) with the description including the gadget you want to add, we will add it for you.
Have you tried to log in to your account with Atlassian as described here: http://www.atlassian.com/licensing/ondemand#evaluatingatlassianondemand-9 and here: http://www.atlassian.com/licensing/ondemand#evaluatingatlassianondemand-10. I do not know if it will work, but this is the only info I found about it.
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