I want to add a watermark to my shots but...
A. I don't know how, and
B. I'm worried my shots when I reupload they will not get as many good ratings.
Although they will get more!
How do I add a watermark?

Do you have editing software? You can very easily add watermarks through Lightroom: right click a photo, select export, scroll down to watermark, select edit watermark, and do whatever you want from there. Once you make your watermark there, you can just have watermark checked and it'll add it to every photo you export automatically. I'm sure you could also bring your photos into paint and just add text wherever you want but it probably won't give you as many options.

If you put your watermark in an obtrusive location on every shot, you will definitely not get as many likes as you would without it. I have not liked photos before because of a sh*tty watermark. Keep your watermark in the corner somewhere.

http://www.exoticspotter.com/ferrari-f430-fort-lee-new-jersey-137839

Make it about that size and you should be good. I'd be wary about making it any bigger as it can become obnoxious. Whatever you do, keep it off the car no matter what.

Thanks, Is it ok to reupload with a mark?

No lol. A lot of my shots don't have watermarks because I uploaded them before I discovered the feature. It doesn't matter.