I'm following the tutorial of loading a dvdrental database as shown in the link below: http://www.postgresqltutorial.com/load-postgresql-sample-database/
I have done the first step successfully but when I came to the step 2 and 3 which navigating the bin folder and loading the data I was stuck. It keeps prompt me with the invalid command message as shown in the picture below.

Anyone know how to solve this issue? Thanks in advance for all the help!