Creating high poly from low poly model I have created a low poly mesh in Blender.
Now I would like to texture it in a different program.
Therefore I would need a high poly model. 
When I add a "Smooth" modifier, nothing happens, my model still looks blocky.
I expected my model to become smooth and the jagged edges would go away: 



Can somebody tell me how I would do this? 
Thank you!
To make it LOOK smooth, select the object, hit 'W' and select 'Shade Smooth'

To ADD POLYGONS, you can optionally select all faces (in face select mode) and hit 'W' then 'Subdivide' This will quadruple your face count. Once that's done, you might want to hit 'W' then 'Smooth' (which actually moves vertices to achieve a smoother mesh).

Or, you can go add a Subdivision Surface Object Modifier, adjust the 'view' and 'render' values until you like the mesh. Apply the modifier to get back to a fully editable mesh again.