If you're not happy with your initial blur results and want to try again, first undo the filter by going up to the Edit menu at the top of the screen and choosing Undo Radial Blur. Or, for a faster way to undo the filter, use the keyboard shortcut Ctrl+Z (Win) / Command+Z (Mac):
I want to allow the girl's face to show through the blurring effect, so with the Gradient Tool, the Black to White gradient and the Radial Gradient style selected, I'll click in the center of her face to set my starting point for the gradient. Then I'll simply drag my mouse towards the left until I'm just beyond her hair. The area in between the starting and end points of the gradient will become a smooth transition area between the blurring effect on "Layer 1" and the original image on the Background layer below it. Since I'm drawing a radial gradient, the gradient will extend 360° around my starting point (which means it doesn't really matter which direction you drag from the starting point), creating a circular shape with black in the center and gradually changing to white as it extends out in all directions:
Adding motion blur is something you will likely do frequently. Saving your settings as a Preset can help you achieve the look you want much faster. Once you have the settings you want, right-click on the Transform Effect and select Save Preset. Choose a memorable description and you are ready to go.
Next you will need to set the blur effect that you want to be applied to your image using the Lightroom brush, radial gradient or linear gradient tool options. These options are very similar for each tool.
Unlike brushes, radial gradients are limited in that they can only be applied in some variation of a round or oval shape. You can access the radial gradient tool by clicking on the Masks icon (circle with a dotted outline). Radial gradients are a great option if you want to apply blur all-around your subject. Something I do really appreciate about radial filters is that they apply the blur evenly.
Linear gradients have long since been my FAVORITE way to create background blur because I feel like I get the best of both worlds. With linear gradients, I can utilize more control than I can with radial filters AND I also get a more even application than I can with brushes! 2b1af7f3a8