How do I change the material of a family?

This post is regarding one particular query, you can see the full list by clicking here.

Materials applied to any individual elements (extrusions, blends, etc.) can be overwritten in any project that the family is loaded into. Find the material in question by accessing the Material Browser under the Manage Tab in the Ribbon.

When creating families it is often useful to assign the material of an element to a type parameter, so the material can be changed by the type properties of that family. To do this, select the element in question (note: joined elements are required to use the same material and will do this automatically), in the Properties Window, find the Material property and click the small grey square to the far right of the window. This will open the Associate Family Parameter dialogue. Press the Add Parameter button. This will open a dialogue requesting you to define the properties of the parameter you are about to create. It is recommended materials are left as type parameters (not instance parameters), as they are generally similar among many families. Give the parameter a name - something like, "Cushion Material" and press OK. Now Press OK on the Associate Family Parameter Dialogue.

When this family is loaded into a Project, with the family selected, press Edit Type and you should be able to find the material parameter you created. Change this to the material desired.