There's not many steps to creating this technique but the images look great once you've finished!
Open your image (File>Open) and then go to Filter>Blur>Motion Blur.
Direction and size
Change the angle to -90deg and change the distance of the pixels until you're happy with the way the image looks. We changed ours to 204. Then click OK to complete your drag landscape. You can change the angle of the blur if your subject requires it. We used -90 deg as our photograph was of flowers infront of a fence.
You've read the article, now go take some fantastic images. You can then upload the pictures, plus any advice and suggestions you have into the dedicated Photo Month forum.