Adding a Texture on to a Material Unity 5

I’m following the space shooter beginner tutorial at the moment and the select box for adding a texture on to a material isn’t shown in the inspector in Unity 5. I searched around a bit and found a way to do it through scripting but is there any way to do it in Unity without scripting? I’m just trying to learn as much as I can about how to do the simple things so I appreciate any insight you guys can provide.

Depending on the shader you use, the available texture slots should be indicated by small circles with a dot in them. If you click on one, window opens where you can select the texture. Alternatively, you can drag a texture onto the circle.