Matmatic is really easy, it's just different.

You need to make a folder in your material library.  Let's say you call it "Matmatic01"

You then need to create a file called userconfig.txt, in your RuntimePython|matmatic folder.   This is what will tell matmatic where you put your Matmatic Materials folder.  The syntax to do this is:

scan :Runtime:libraries:materials:Matmatic01*

In other words the only thing you need to add, to that new usercongig.txt file is:

scan :Runtime:libraries:materials:Matmatic01*

Now go search around for Matmatic scripts.  When you find one you like right-click on it, ans select save as.  you can name it whatever you want, but you need to end the name with ".mm1" WHile saving the script, create a subdirectory; in the Matmatic01 folder, with the name of the script, and save the script in there.  You can repeat this as mny times as you want, before you move on to the last step.

Run the compile.py, within your RuntimePythonmatmatic folder.

Now browse to your new RuntimeMaterialsMatmatic01 folder(From the materials room Library Palette;) and then into the new folder.  If you were already there when you ran the compile.py you'll need to leave and go back.  The new material files will all then be there.  They wo'nt have proper thumbnail, but they'll work great!
It may help to make another sub-directory(within the first sub-directory) with the HTML page of the script(I do.)