I am trying to create a watermark to use in Lightroom. Once I have it created in Photoshop how do export it and then import it into Lightroom and add it to my photos?
In Photoshop, save the watermark as a jpg or png to a folder of your choice on your hard drive.
Lightroom only uses watermarks on export, so they are set up under Watermarks in the Export dialog.
Choose Edit watermarks from the dropdown menu, then in the Watermark editor, choose the image under Image options, top right in the editor.
You can also create text watermarks in the Watermark editor.