Converting Lyx files to PDF

[Dr. Antonio Botelho de Sousa]

Does anyone can tell me if there is a way of exporting Lyx files to PDF.
Of course i can save the Lyx file as a PSf file and then use Acrobat 
Distiller in Windows.
But can io do that directly from Lyx.
Thanls for your help.
Botelho de Sousa
Portugal