How do I open a new folder with key strokes in documents under Finder?

When I use Finder to save a document, I select a folder ad then may want to create another folder within the existing one or parallel to it. But although both the 'new folder' and 'save' buttons exist on the menu, they fall below my screen line and cannot be accessed. Command S works to save the document but Command Shift N does not create a new folder - it says I have gone 'icognito'. Not what I wnat.

Can you help?