How to change material from diffuse? I'm very new to Blender, and I've been watching the Blender Guru tutorials. I've gotten to the materials episode, and the person in the video has a dropdown menu to change the texture from Diffuse to Glossy or any number of others. I can't seem to find a way to change from Diffuse, and I'm very confused. 

I'm in Blender 2.79 if that helps, thanks.
Maybe you need to switch from Blender Render to Cycles Render