Right click on the background and select CREATE NEW TASK (or select it from the ACTIONS pane on the right)
On the GENERAL TAB, enter whatever task name and description you want
On the GENERAL TAB, you will likely want to click CHANGE USER OR GROUP button (middle right) and have the job run as someone else
like a service account you created in Active Directory just for this task
note the you can use the SYSTEM account for many tasks but after you set it to run as SYSTEM you can not longer change the task because you don’t know the password
On the TRIGGERS tab, click the NEW button and set whatever trigger you want, most commonly a time of day
On the ACTIONS tab, click NEW and:
In ACTIONS select START A PROGRAM
In PROGRAMS SCRIPT type POWERSHELL (not case sensitive)
In ADD ARGUMENTS enter the full path to your .PS1 script
On the CONDITIONS tab, set as you please but often unselecting all options
On the SETTINGS tab you likely want to configure it to run
ON DEMAND (so you can right click on it and force it to run anytime you want)
IF THE TASK FAILS, RESTART EVERY whatever you want
STOP THE TASK IF IT RUNS LONGER THAN whatever you want