How to delete course from AWS Open edX Bitnami?

I followed the steps mentioned over - https://openedx.atlassian.net/wiki/spaces/OXA/pages/158194136/How+to+delete+a+course

But it is not working.
OpenEdx URL - https://testacademy.nimbal.co.nz.

Could you please share the exact steps for deleting any course under OpenEdx.