Originally Posted by cyberxxx

1) Run it
2) Select the thumbs or whole folders of pics you want to watermark
3) Press F3
4) Set the output format (compression level etc) and output path (the overwrite possibility is also available)
5) Click "Advanced Options->Text" and add some watermark text you want as well as it's font, color, position etc
6) Click "Ok" and then "Start"

That's it.

P.S. If you need a watermark as a picture (transparent .png-s are also supported btw), you have to choose "Advanced Options->Watermark" instead or "Advanced Options->Text"