Change picture orientation

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You mean rotate the image or crop out a portrait shot from an existing landscape shot?

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Therefore you need the crop tool. You can set the crop, i.e. 4x6 in the options.

I don't have elements. You need to crop the picture in 3 x 2 ratio. You took the picture in 2 x 3 ratio.

Raw won't make any difference at all when you are changing the orientation. Raw's capabilities come into play with things like exposure, colour and white balance, not composition. Also I use CS3, but I'm thinking elements must have these basic features as well.

If you want the entire thing rotated, rotate the canvas 90 degrees. If you want to crop it out, click on your crop tool, set the size in the tool bar to 4 in x 6 in drag your mouse over it and then position the crop where you want it. If you specify the size then it will limit you to that size of crop. Hit enter when you're ready and there you go.