To authenticate, go to scratch.mit.edu/projects/918341582 and comment your code, then press the "commented" checkbox in the project.
If you're interested in using this tool in your projects, export it and include it as the first scene in your project. But a note about security -- this isn't secure, because anyone can just change the "logged-in" details. There's a basic security measure of making sure the username matches the ID, but that can obviously be skipped by a clever code editor. Also, although collision is highly unlikely (1 out of 3.48e5, roughly equivalent to 0.0003%), it is possible, because codes are chosen randomly. Collision probability can also be decreased by adding additional words/numbers as part of the code.
