Just start the project. Try logging out and running it.
To use this API in your project, first give credit to me and a link to my profile. Then, drag the define script in your backpack, and put it in your project. Now, use the new block whenever you would like to check if you're signed in, and it will broadcast 'nsi' (without the quotes) if you are not signed in. If you are it will do nothing.
