Combine the blueberries and agave in a small pot. Heat over medium heat, stirring often, until sugars dissolve. Add salt and let cool to room temperature.
Puree blueberry mixture in a blender until smooth. Strain through a fine-mesh strainer to remove seeds. Whisk in yogurt. Chill for at least 4 hours or overnight.
Set the Vida™ by PADERNO Digital Stainless Steel Ice Cream Maker to the ice cream setting and press start. Pour the chilled mixture into the bowl. Churn for 25 minutes or until softly frozen and fluffy. Serve immediately or transfer to an airtight container and freeze.
