If the Accu-Chek SmartGuide Predict app predicts a high (hyperglycaemic episode) within the next 30 minutes:
Consider doing some physical activity (e.g., going for a walk) or making an insulin correction to stay in range. If you have already injected bolus insulin, wait until the insulin comes to its full effect before you take further measures.

In addition to monitoring the excursion of the glucose prediction on the Accu-Chek SmartGuide Predict app, check the actual CGM value and monitor the course of the glucose carefully to asssess whether further action is needed.
All treatment decisions should be discussed with your diabetes care team.

If the Accu-Chek SmartGuide Predict app predicts a high within the next 31-120 minutes:
Wait and watch. Do not act upon this prediction now. Closely monitor your predictions and current glucose values. Note that glucose influencing factors like carbs intake, insulin injection, and activity can change the prediction again. Check your prediction in 30 min and then decide if exercise or insulin for correction is needed. All treatment decisions should be discussed with your diabetes care team.