Convert loaded DCM file to stl, export stl

I have loaded the dcm file. (Version 4.9)

How do I make 2D information 3D ?

And how do I extract the created 3D file to stl?

What you need is the tutorial. Enjoy.
https://www.slicer.org/wiki/Documentation/4.8/Training#Segmentation_for_3D_printing

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There are also some more tutorials here: https://www.slicer.org/wiki/Documentation/Nightly/Training#Slicer4_Image_Segmentation and a new direct file export feature describes here: Save segmentation directly to STL or OBJ files