Drag the number icon from the toolbar onto your dashboard to add a new metric to the dashboard. Click the cog icon to edit it.
The label shown under the value of this metric.
Data Model & Metric
Choose a data model to select a metric from, then a metric within that data model to display the result of.
You can add filters to the metric here. These filters will only apply to this metric, and not be editable by viewers.
Ignore Dashboard Filters
Check this box if you want this metric to ignore dashboard filters. When this is set, only the filters specified on the metric will be used.