Template: Team Task List by Priority

Hi Everyone,

I'm new to Smartsheet.  In the Template titled Team Task List by Priority, there are headers.  High Priority, Medium Priority, Low Priority and Completed.  

My question is: how do the tasks in lines below the priorities get assigned to which priority? Do they get auto-populated to each priority based on something? Or does the owner of the file individually move each line from one priority to another?

Thank you so much in advance.