I don't know why you sent the above link. It is irrelevant. Start the GUI version of ppm by just typing "ppm" with no args at the command prompt. The command line interface still works, but I think you will find the GUI easier to use.

"Edit|Preferences|Repositories" is short hand for showing how to navigate the GUI buttons. Top of screen shows active repositories. There is a whole screen section called "Add repositories" and a pull down menu that you can select more repositories from. It is hard for me to understand how you can actually get to this screen and not see the buttons to do the adds.

I think all you need will be in the main ActiveState repository. Note that every time you start ppm GUI it will resync/update the list of available packages.

You never answered question: what packages are you looking for?