I down loaded the 30 day trial for lightroom. I am trying to figure out how to do everything by watching video's but I can't seem to figure out how to add an overlay. I did see that it said to go to file then plugin extra's but then It wont let me click on anything. How do I change this. I don't need to pay extra for that do I?
You could do it in the print module by choosing caption or title which will display those metadata fields on or below the photo. You can then output to a jpeg file rafter than sending to printer.
If the overlay is identical for each image you could use the watermark feature which also lets you adjust opacity, or its also possible to edit and use the nameplate.