I can't find the materials tab. I have tried blender tutorials but they already have the tabs. I just have these 5 tabs:
Here is the materials tab:
Note: If you can't see it there, hover over the tabs and scroll with the Middle Mouse Button.
Also be sure that you have a mesh selected, if you don't blender will not show the materials tab.
Almost any video tutorial should show you were that is, so I'd recommend you research some more.