Bring up your colour wheel. Click "More" to open the palate.
Since it's already black, we don't need to do anything here. From the drop down menu, pull up "Secondary:
Type in the code Angel gives you:
Go to your tools, scan down to "Gradient" and make sure it's "Linear".
Open any size canvas. It doesn't matter the size, since this is only a test. Put your gradient tool anywhere on the page, like so:
Pull it anywhere downward that you'd like. I've shown you how I dragged mine by the white line. When you have completed, you'll see how it goes from black to pink and all the colours in between.
Did you find this tutorial useful? Why not try your hand at it?