Follow the steps below to Create Dashboard In Jira:

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Click on Three Dots (Top-Right side) > Choose Create Dashboard (From Dropdown menu) > Add details (Name, Description) > Select an Access (Private, Public, Group, etc.) > Click on ‘Save’ button.
Follow the steps below to Add Gadget to Your Dashboard:
Go to Dashboard > Click on add new gadget > Click on Load All Gadget > Click on the ‘Add Gadget’ button in front of the Gadget.