To add an image as watermark click on the button on the Watermark sidebar option.
Specify a position
Select where you want to place your watermark:
You can also specify the location in Pixel or in Percent relative to the watermark's placement above.
Add images to be watermarked
To add images to be watermarked, select the Sources sidebar option and click the button to select multiple images.
To read all the images inside a folder, check the " Images from folder" checkbox.
Apply the watermark
Apply the watermark by clicking the Apply button on the toolbar
The activity bar will present you with progressbar indicator. If process is complete,
Simplemarker will open the finder window containing the images with watermark.
A sample watermark placed at the top right corner with 0pixel X and Y coordinates.