Adobe Photoshop Lightroom is not an easy program to figure out on your own. There are some important switches buried deep inside its preference menus. Preference menus are dull material in any program, but a wise man looks the under the hood before buying a used car.
Adobe Photoshop Lightroom 4 Preferences Menu
Adobe Photoshop Lightroom 3 Preferences Menu
Ironically, some of the most important Preferences in Photoshop Lightroom live in the Catalog Settings Menu. If you skip the critical “write changes into XMP” switch; and if you never find Lightroom’s other hidden save buttons, and if your Lightroom Catalog file ever gets corrupted, then could lose years of your work! Years of effort in Lightroom could vanish in an instant.
To truly understand the advantages, and disadvantages, of the “Automatically Write Changes to XMP” preference switch please watch this excellent tutorial from Adobe Evangelist Julieanne Kost.
Once you have all your switches set, I suggest checking out this tutorial on how to build a Metadata Preset so that Lightroom can automatically add your copyright information into each and every photo that it ever references!