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a.If you haven't worked with gradients much in the past you will probably need to load a couple of gradient presets into your gradient library.
b. To do this go to Edit>Preset Manager...
c. Choose Gradients from the dropdown menu, then hit the load button. You will get a file browser window, load the Special Effects presets.
d. Hold Ctrl and click on the text layer to load its selection.
e. Click on the "Create new fill or adjustment layer" button on the layers pallete:
and select Gradient map from the menu that appears.