How can I upload an addon to the workshop?

I can’t seem to figure out how to make that Gmad thing work. Can anyone explain with a little bit more detail how to upload mods to workshop?

If it’s easier for you, use the workshopper GUI tool that garry provided, but it requires vista or higher
http://forum.facepunch.com/showthread.php?t=1220463

Problem is I can’t download it.

How come?

Ill provide a mirror link if you need one.

[editline]18th October 2013[/editline]

Thank you dude! You just saved me from having to think how Gmad works.

Np. Try to upload the addon, and if its sucessful, then close the thread, if not, we are here to help.