mySugr Glucose Insights predicts where your glucose levels might go in the next 2 hours. This prediction is based on your past CGM values, and your logged carbohydrate and bolus insulin entries in the mySugr Logbook.
The glucose prediction displays on the graph on the Home screen when at least 1 hour of continuous CGM data is transferred successfully to mySugr Glucose Insights.

The graph shows your glucose levels during the previous hour, as they are now, and their predicted range for the next 2 hours. The sequence of dark green dots in the predicted range represents your projected average glucose. The accuracy of your predicted glucose range decreases the further out in time it is, as shown by the expanding vertical bars.