After logging into Scratch you will see that there is a tab for more blocks.
Follow the installation instructions that appear, note that they are different depending on your preferred web browser.
Use these new blocks to make your Scratch programs recognise input from the WeDo distance and tilt sensors, or use Scratch to control the WeDo Motor.
Here is the basic program for a chomping crocodile
or click below to access the program to control your WeDo crocodile from this page.