Adding materials gave us a colour on our object, but sometimes we want to have a texture as well to make it look a bit more realistic.  

Select your object

Open the textures buttons  (or press F6)

You won't see many buttons yet - we need to create a texture.

Press and hold down the menu button on the toolbar

Choose ADD NEW (More buttons should appear!)

Click on the menu arrow under Texture Type.

Choose Stucci

Then adjust the settings until you have a texture that you like. 
Render your image (F12) - the texture won't show yet.

Return to the materials buttons, (F5) making sure that your object is still highlighted.

On the right-hand side, select the “Map To” tab

Select Nor (it should be dark blue with white writing)

Then render again (F12).  You should have a nice shiny textured surface on your object.

Explore the other textures (F6), especially Noise, Image and Blend.