The "Assigned to:" box will initially display "admin" as the default value. However, if you're creating the report, you can change it to your own name. There are two methods to do this: Click on the arrow next to the box. A pop-up box will appear, allowing you to search for any user by their first name, last name, or username.
Alternatively, you can simply type in the name of the person creating the report to change the assigned user.