Edit your value and effort estimation defaults
To edit your Product Details, you'll need to be a License Account Manager. If you are, you'll see the gear icon in the upper right of your screen after you selected a product to view from the main Products page.
To change your estimation midpoints for value and effort, you can edit it on the Dev Ideas page. Click Save settings to save.
Those will appear on the Dev Ideas in the estimation module. See the example below: