The watermark on proofing images displays in the center of images. To control the exact location the watermark displays, create a file in photoshop or another photo editing software that is 3000x1730 pixels with a transparent background and place your logo in the desired location. Save the file as a PNG.
Then from the settings area of the proofing control panel, you can upload the PNG as your watermark.
Click add files or drag and drop your logo to watermark visibility area indicated.
After you upload the watermark and edit the settings, click save changes.