You must be a JIRA admin to add a gadget to a dashboard in JIRA. Some applications allow dashboards that are shared by groups of people. If you have permission to update a shared dashboard, the other people sharing the dashboard will see your changes too.
Following are the steps to add a gadget to a dashboard:
Go to the dashboard by selecting the Dashboards link in the navigation bar.
Click Add Gadget on the dashboard.
Use the gadget wizard to pick the gadgets you want to add.
