You should have received your authorization code at around 9:00 AM yesterday. If you still did not receive the e-mail, please let us know and we will re-send the code to you. We apologize for the delay.
As for the Grid Shader, you can find it in the Material Editor Panel. First click the "+" button to expand the shader controls. Then, in the "Color" drop-down menu, select "Grid" and this will open up the new Grid Shader window.