Video - Scaling Textures (3:10)
Video - Scaling Texture 2 (0:12)
To change the scale of a texture, make sure you are in the Texture panel and have selected the texture using the 'picker' icon. Once the surface is selected (you will see the current texture displayed under Library Material), find U Scale and V Scale in the texture settings. Either adjust the sliders as desired or enter a desired value to scale the material.
To scale in one direction, deselect the 'link' button and adjust only U Scale OR V Scale.