If you load the image directly from your camera that was shot in portrait orientation, you see it as a portrait, but the image is still saved as a landscape image so it will load in psw as such, a landscape image. 

Here's how I've managed to rotate an image in pws.  You've already managed to rotate it and you get those two white bands on each side so I won't repeat those steps.  Thing is psw rotates the image, not the canvas...  Once you've rotated it and you have those two white bands on each side, go to  Render Settings and click on the Canvas set-up tab.  Where there's canvas size, click on the button "change" .  Uncheck the Keep proportional box and invert the size of your image (if your image was 1000x500, put in 500X1000).  Once this is done, most likely your image won't be positioned properly on the canvas, you will need to drag it in the center so that the image fills all the canvas, to do this, click and hold to drag it. 

There may be an easier way of doing this, I'm very far from being an expert with pws, but if this is really the only way, you're probably better off rotating your image in photoshop or some other program where it's much simpler, save it, and then bring it in to psw to add whatever effect you want to add to it.

Lucie
finfond.net
finfond.net (store)