Backendless is not defined using java script

Mission: RELATIONS MASTER
Task: *Set Object Relationships with API
can any one help me in fixing this error when i run using web console

Capture

Hey @Suprith_k_s,

to see how to setup Backendless library in your app please follow this docs:
https://backendless.com/docs/js/setup.html

For any JavaScript-related questions that are not related to Backendless itself, please post to StackOverflow.

Regards,
Stanislaw