To add a Key Value:
- Expand the Key Value header.
- Click the blue “Add Key Value” button.
- Click the respective cell in the spreadsheet. The Key Value will appear at the top left of your metric.
- You can then label it by clicking the dropdown arrow next to the key value you just added. Find the field that says "Key Value Label" and give it a title. The label will show up beneath the value itself on your metric.
Key values also let you add a comparison value in order to compare growth between two time frames. Check out this article for more info.