I think the whole answer to your question is beyond the scope of this community. This Community forum is intended to solve problems related to the Bitnami Stacks, Virtual Machine or Cloud Images.
For information regarding the application itself or customization of the content within the application, we highly recommend checking forums and user guides made available by the project behind the application.
Any case there are a lot of tutorial on the Internet about how to publish an application and make it publicly available. A good starting point may be this: https://www.youtube.com/results?search_query=bitnami+moodle
If you have any other question and you think we can help, please don’t hesitate to ask.