Hi, so first, you must make your file into a custom watermark. Navigate to the file on your site, then photo tools > make into watermark. Give it a name, opacity, etc.
Then
in a gallery, you choose photo tools>watermarking
then select the photos you want watermarked, and apply this new watermark.
Comments
Then
in a gallery, you choose photo tools>watermarking
then select the photos you want watermarked, and apply this new watermark.
More help here: http://www.smugmug.com/help/custom-watermark-protection
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