What I normally do:
If PDF - Use built-in capture tool and copy the floor plan. Open paint and paste it. Crop the image and save it as an image file. Open it with Windows Picture Viewer and rotate it from there. (Could also use another pic editor to rotate)
If Image file - Open it with Windows Picture Viewer and rotate it from there. (Could also use another pic editor to rotate)
Just make sure when you capture the image, try to get it at the highest resolution possible. When you zoom in on VisualRF, it will degrade the image a bit and might make words blurry or distorted.