Add a PicBadge to your picture as demonstrated here.
After clicking the ’Next’ button make sure that ’My timeline’ is selected and that ’Set as profile picture’ is checked and click ’Publish’.
In the next screen you can invite friends to add the PicBadge too.
Please wait until the upload process is finished
In the next screen, click ’Continue to Facebook’. You’ll be directed to your Facebook account. There, click and drag the gray boxes in the corners of the lighter square to adjust the cropping area in the picture and, when done, click the ’Finished cropping’ link beneath the picture.