The Scratch website allows Scratch programmers to upload their projects and make them available to anyone visiting the website. This allows Scratch programmers to show off their work and to learn from the work of others. In fact, every Scratch project that is uploaded to the website can be downloaded and used as the basis for creating new projects. You can post your Scratch projects in different galleries or create a gallery of your own and even control whether anyone else is allowed to upload their projects into it.
In order to upload your Scratch projects to the Scratch website, you must sign up for a free account, which you can do by clicking on the sign up link at the top of every page on the Scratch website. Clicking on this link opens the Create an Account page. Once you have finished filling out the required information, click on the Sign Up button. A new account will then be created for you, and you will be logged into the website
Once you have created a new account, you can begin uploading your Scratch applications. The first step in sharing a Scratch application is to click on the Share! Button located at the top of the Scratch IDE. Begin by keying in your account name and password and then provide a name for your project. Next, enter any notes that you think other Scratch programmers visiting the Scratch website will need to know to work with your application.
In addition to providing instructions about how to work with your application, you should also use the Project Notes area to acknowledge the source of any audio or graphic files that you use in your application.
Scratch also supports an optional tagging feature that you can use to help other Scratch programmers locate your applications when searching the Scratch website. By default, Scratch lets you select any of six predefined tags covering the following categories.
In addition, you can also create as many as four custom tags by supplying keywords that you think best describe your application and its purpose. Once you have finished filling out this window, click on the OK button, and the upload process will begin.
Once an upload is started, a dialog window is displayed, allowing you to track the progress of the upload process.
Source: Scratch Programming for Teens y Jerry Lee Ford.