Just re-read this--it sounds like you've worked your way through the query system (story guide) and are now at the point where Dramatica asks you to create scenes one-by-one. If you do this (hit create on your first scene), then hit "Describe Scene", you'll see at the bottom left corner a list of options that includes Main Character throughline, Objective Story throughline, etc. If you click on each of those, it'll give you a check-box list of storypoints to choose from. Click on one or more of those, and it should bring up the illustrations and gists you previously entered. You can choose from these to create your scene.
So for example, if I decide to start a scene with my MC throughline, and I click Concern -- The Past, I might see that I have a gist/illustration of "Addressing Someone's Dark Past" there. So in the "what happens" box, I could type: "In this scene, Rebecca discovers a diary written by her long-dead serial killer grandfather. Realizing the truth about him causes her inner turmoil; she decides that she will confront her family at the upcoming reunion."
That said, as @MWollaeger said, there are many pathways for using Dramatica, and I personally don't think the Story Guides are the most intuitive or easiest.
I would instead suggest using the "Dramatica for Screenwriters" dropdown on the same menu (this can be used for anything--not just screenplays). It doesn't require reading the book of the same name, but I do recommend it. Working through the Dramatica in 10 minutes and Instant Dramatica paths will give you a good synopsis you can write from. The "Plot Sequence Report" path is great for a more detailed outline, but it might be overkill at this point. (Overkill is very easy to do with Dramatica).
Another option if you're interested is @jhull's Subtext service. Subtext is grounded in Dramatica, but takes a more user-friendly approach. You can upload your storyform there (or choose from an existing one) to create an outline/treatment.