A family of Microsoft word processing software products for creating web, email, and print documents.
When you inserted the watermark, did you check the box for "Washout"? (I believe it is selected automatically.) If the picture is still too obvious, you can adjust it manually. A watermark is just a picture anchored to the header, so access the header, click on the picture, and increase the Brightness. You can also reduce the contrast, set it to Grayscale, or make other adjustments.