To edit a metric's settings you will want to start in the "Metrics" section as shown below. From here, you will want to click on the metric itself. Note: if you'd like to edit multiple metrics you can use the check boxes to the left

Click into the data source and metric you want to change formatting of

After you click the metric a window similar to the one below will appear. Click into Settings. From here you will be able to edit your metric name, category, description, aggregation, default charting color, unit, decimals, and currency.

Please let us know if you have any additional questions!