At the time of execution, you must close all the UFT instances.

To schedule:

Click Execute.
The Suite screen appears.
Click the suite to be executed from the left pane.
All the test cases under the selected suite appears in the right pane.
Select the test case.
You need to mark at least one case to execute the run.
Click Schedule.
The Schedule list screen appears. In Schedule list, the list of schedule shows details of Schedule Name, Type, Created by, and Created on.
Click Add.
Add Build Number and Release Number in their respective fields.
Select Start Date and Start Time.
Select Type daily, weekly, or monthly. Choose Day or Days.
The schedule would start suite runs based on the values set for start date and start time. Further, the runs will be performed on weekly, monthly, or daily basis based on the schedule created for specific suite.
Click OK.

In Schedule list, you will see the new added schedule.

You can edit or remove the schedule.

To edit the existing schedule, select the schedule and click Edit and make the desired changes. You will notice the changes in the schedule.
To remove the schedule, select the schedule and click Remove.

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