Hello GUI help - How do I - "give it permission to run (chmod 755 update_hash.sh)

Learning Library Tutorials & Examples
#1

Hi, I’m getting the same error message on the tutorial, but I don’t understand how to give the file "permission to run ( chmod 755 update_hash.sh )."

Screen Shot 2020-05-28 at 7.12.54 PM
Screen Shot 2020-05-28 at 7.12.54 PM1348×610 114 KB

I’m getting this error on my HTML site

Gui
Gui883×393 163 KB

Appreciate any help!
Thanks,
Kamal