Add the Mapit gadget to your dashboard

Click the "Add Gadget" link at the top right of the dashboard
(note: if this link is not available, you need to select or create a dashboard that you are allowed to customise)
Type "Mapit" in the search box
Click the "Add now" button for the Mapit gadget
Close the "Add a gadget" dialog. The Mapit gadget is now on your dashboard!
You can of course move the gadget around according to your preferred layout, and change the header colour, just like any other JIRA gadget.

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