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How do I customize CSS tags for image alignment?

Edit the style.css file of your theme and add some CSS like this:

.imageframe { margin: 10px; padding: 5px; border: 1px solid #aaa; }
.alignleft { float: left; }
.alignright { float: right; }
.centered { margin-left: auto; margin-right: auto; }

Watermarking does not seem to work?

Make sure:

1. Your web server's PHP includes the GD graphic library module
2. You have provided a signature file and specified its path in the option page