Whenever we post an image to social media or our website, we like to include a watermark with our copyright information. In our workflow we use Adobe Lightroom and adding a watermark is very simple in the export routine.

In the Export dialog box, you'll see a tab for Watermark. If you haven't already done so, you'll want to set one up.

Read the Lightroom help files for details on how to use this section but here are a few pointers.

Image Options - If you want the watermark to be a graphic logo then you'll specify the logo file here. PNG files support transparency while JPG files do not.
Text Options - Select the font of your choice. Of course Corbell Workshops will be using 'Corbel" as our font.
Watermark Effects - This section defines how large the watermark will be as well as the placement on the image. The trick here is to specify some 'Inset' values. This will keep the watermark from sitting right on the edge of the image.
When you're done editing the watermark, you may find the 'saving' process a little confusing. I don't think it flows right. Don't just click Done. Instead you'll want to click on the drop down menu above the image and save the watermark.