Step Two) Open up another document that is 1px in height and however many letters your sitename is in width. Firelush is 8 letters. My width is 8px. Grab your zoom tool and on this layer hit "Fit Screen".
Step Three) Select your gradient tool. Make a gradient if you need. Then, drag from left to right across that document we made above.
Step Four) Make each letter of your text how it lines up on that document. Highlight one letter at a time and use the eyedropper tool to grab the color from the gradient document.
That is all! You're finished! Congratulations!