Facebook Audience Network for Mobile Web - How to Setup?

I am having trouble setting up audience network for mobile web.

I have set it to work with Instant Articles and it’s working great, however I also would like to run it for mobile web, but I am having trouble understanding how to set it up.

The instructions from FB sound like sanscrit to me, I have no idea why instead of providing detailed step by step guide FB writes something really hard to understand.

When I create a new placement it does not give me a choice for where it’s created and I am only getting iFrame tag, it looks like I have to generate some java code to use it with DFP, but I am not sure how to generate it. However I might be doing something wrong.

If someone can help/guide on how to use Audience network for mobile web - I would appreciate it.

I want to run Audience Network in DFP (along with other networks I already work with) for mobile web.

To clarify some of my struggles:

Instruction says: choice on the left Ad Spaces and click ‘create ad space’, but instead I only have there ’Placements’, where I can only give it a name and get the iFrame code.

For some reason I do not have the Ad Spaces option.

Is there something I should do to enable it?