If I understand the question correctly (how do you get a smooth edge), you bevel/chamfer the edges.  Press the B ball-shaped button and it will pop up a list of edge chamfering options.**

T**  opens your computer's list of fonts.

Q  (horizontal slider) controls the mesh resolution, i.e., low-poly to high polygon count.

E  (hor. slider) controls extrusion depth.

e  toggles to open/close a strip window which displays the text which you've entered, in the selected font.  I didn't have it open when I took the screenshot above.

B  opens a menu list of edge bevel (chamfer) options.

S  (hor. slider) scales the edge bevel.

F  opens the file save prompt box.

H  is for help, but if you mouse over a button to highlight it, you'll get it's name;  then press F1 to get a brief description of the button's function.

Poser 12, in feet.  

OSes:  Win7Prox64, Win7Ultx64

Silo Pro 2.5.6 64bit, Vue Infinite 2014.7, Genetica 4.0 Studio, UV Mapper Pro, UV Layout Pro, PhotoImpact X3, GIF Animator 5