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Do you have a favorite software for editing your photos? It might help to know your workflow in order to advise you appropriately. Many programs have the ability to do this. Once you settle on a particular method, it's helpful to set a routine were you export images you intend to share as smaller version, usually around 1200 to 2000 pixels on the long side, so you're not uploading full sized jpegs, and put them in a cloud storage folder, like Dropbox. I have a folder called Social Media that I put them into and from time to time I cull that folder so it doesn't get too full. That way you can access the images from a smart phone, another computer, a tablet, etc. For creating the watermark, I contracted with Photo Logo to create my own 'signature' style logo. I use that file within a program from Adobe called Lightroom, to add the watermark if and when I need it to be added. I don't use it very often, but it's handy to be able to help people recognized the author of the photo when shared online and build name recognition perhaps.

Perfect, thanks for the advice. I rarely edit my photos at all, though sometimes I do the slightest basic adjustments with the windows photo editor, other than that I like to keep it to an abosulute minimum. I just needed to know the best program to add a watermark. Luckily, my father is a graphic designer so I do not have to worry about the design aspect. As for the cloud and dropbox part, I will be definitely be implementing that soon!
Cheers @macalterego feel free to check out my blog.