To change the unit for a metric you will need to start in the "Data" section. From here, you will need to navigate to the respective metric and select "Settings" to the right of the metric as shown below:

From here, the settings and options for the metric will display as shown below. You can change the unit in the bottom section titled, "Unit & Format". Make any necessary changes, click "Save", and your metric will be good to go. 

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