Rename Material

I’m following the Roll-A-Ball tutorial, and in the tutorial, they duplicate a material using CTRL+D (Windows). However, they double click it and then edit the name. I can’t edit the name via double clicking, or by right clicking and looking at the context menu. How do I rename a duplicated material?

Under Windows: Select item in hierachy view and then a) press F2 or b) click item again and wait