You can use the provided Text-Gadget in which you can enter arbitrary HTML.
As this is a potential security risk, it has to be manually enabled by your JIRA Administrator:
Manage-Addons -> System Add-ons -> Expand
-> Expand the Modules and enable 'Text (text-gadget)'
you can enable it just hover over disable and it will bring up an enable button..
only problem is that the text gadgets do not work with a system dashboard... so in essence.. its a pretty much useless gadget as the only time i would use it would be on a system dashboard to display an iframe etc
HTML also works on the system dashboard. Maybe its just that the text-gadget is not available for anonymous users, can't say exactly. But maybe the 'Introduction-Gadget' can help you in that situation? just be aware that you'll need to set the text/html for it via Administration > System > General Configuration
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