Hi, Im new here

I'm having trouble with my assembly, i looked up a lot of forums but i can't find a solution.

They say that if i want to save my assembly into a single part i should go to save as and there chose *.sldprt

But i dont have the option. I only have *.sldasm and *.edrw. What am i doing wrong?

Tnx for help, I have Solidworks 2009 sp3 Student Kit