1. Go to https://scratch.mit.edu/ and make sure you are signed in with your regular username and password
2. Start with the "Getting Started" Tutorial on the Scratch website. Then start exploring the other tutorials on their page or start a project of your own.
3. Make a game of your own that other people will be able to play once you are finished. Below are possible examples...do NOT just copy from those sites or other people's existing games!!