The ADD WIDGET and EDIT LAYOUT buttons you see in the top right corner of your Dashboard are features coming soon to the Chainlink Marketing Platform. When added, you will be able to add any new widgets and completely customize the layout of your dashboard.
When hovering over any of the widgets on the dashboard, you will see a gear icon in the top right corner. If you click the icon you will be given the options of editing or deleting that widget. These features are also coming soon to the Chainlink Marking Platform.