How do I edit/delete the milestones for a sensor?

1. Go to Pours
2. Tap the pour and then the 3 aligned dots next to the pour name, to edit milestones for all sensors in a pour  . Or click a specific sensor to edit milestones on only that sensor.
3. Tap the bin icon  to delete a milestone
4. Tap "Add milestone" to add a new milestone to that pour 

Note: Editing the milestones for a pour will update any unreached milestones for active sensors and all future sensors/pours.