Corel Aftershot Pro has the easiest watermark embedding process I've found. I have a real problem with Adobe's monthly fee system, so I switched over to Aftershot Pro. You can purchase the program at Amazon for $28. You can download a free trial of the program at Corel.com
With any program that allows you to put a text on the photo, on a pc if you hold down the alternate key and type in 0 1 6 9 using the numerical keypad, you will create a copyright symbol. It can be done on a Mac, but it's a different sequence and a Google search "creating copyright symbol on a Mac" should provide the needed information.