If they're free, they're enabled, if they're paid, go to your OnDemand account and buy them. If they're not on the list of supported plugins, then you can't.
See https://confluence.atlassian.com/display/AOD/Atlassian+OnDemand+Plugin+Policy
They are listed in the System Plug-ins but the are disabled. I can't find any option or way to enable them. From what I can find online, both sets of features should be available in OnDemand now.
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