Assigning materials to a mesh

Hi, I’m modelling a ballpoint to get to know the prog and I’d like to assign 2 materials to it (1 material to 1 part and the other material to the other part) I’ve noticed that I can assign 1 material to the entire mesh but I haven’t figured out how to assign the other material to it’s part of the mesh. Any feedback is greatly appreciated.

http://www.blender.org/modules/documentation/htmlI/x4272.html

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Thx