dual layer in one step movie?

Can anyone help please?

I've got the dual layer DVD now, as it says, and then this comes up

[IMG]http://img69.imageshack.us/img69/7807/screenshot20120101at145.png[/IMG]

but when I try to i get this, can't change it.

[IMG]http://img577.imageshack.us/img577/6176/screenshot20120101at145d.png[/IMG]

What's the deal here? If I start a new project you can get to it, but come out and it changes back again...

I know nothing about disc images etc, and only know how to use one step... Is there a quick fix?

EDIT

I tried going in the normal way by starting a project and dragging it on to the thingy, changed all settings like they asked, and still.... I always get some sort of warning when doing it this way, and it never works. What empty drop zone, it's just been encoding it, so it must be there?

[I]The following warnings were found during the validation of the current project:

- There is an empty drop zone in your project. If you don’t add content to it before burning the project, it will appear as a grey area in your finished DVD.[/I]

so you see, One step was my saviour, and I hate the programme doing it the correct way, it just never works. One step was built for idiots like me.