Start by filling the background with a solid color or gradient of your choosing, using either the paint bucket or gradient tool.
Next type in the text you want to make look frosty using the Text tool. (This works best if the font is really large and bold mine here is around 240px)
With the text layer selected click on the “fx” button at the bottom of the layers panel to open the Layer Style dialogue box. First thing you’ll want to do is turn...