1 Choose Image > Variables > Define, or choose Variables from the Layers palette menu.
2 Choose the layer which contains the variable from the Layer pop-up menu.
3 Enter a name in the Name text box. Variable names must begin with a letter, underscore, or colon and cannot contain spaces or special characters (except for periods, hyphens, underscores, and colons).
Note: If you are using data sets and want to rename a variable globally (in all layers), change the name in the Data Sets section of the Variable dialog box. (See "Using data sets" on page 503.)
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Adobe Photoshop can be a complex tool only because you can do so much with it, however for in this video series, we're going to keep it as simple as possible. In fact, in this video you'll see an overview of the few tools and Adobe Photoshop features we will use. When you see this video, you'll see how you can do so much with so few features, but you'll learn how to use them in depth in the future videos.