The Edit Screen will be the main window you use to create your manga.
In the Edit Screen you will find the manga Page and manga Panels.
Drag and drop all sorts of raw materials into the Edit Screen, then arrange them on the page to create your manga.

You can have the items and characters that you drop into the panels appear inside or outside of them.
Aside from your mouse, you can use the Toolbar and layer properties area to fine tune your edits.