Go to "The Simpsons Movie" website--the web address can be found in the resources section--and click the button in the center bottom of the homepage to enter the site.
Click the button at the top of the resulting page that says "Create Your Simpsons Avatar" that appears at the top of the page.
Click the right-hand button that says "New Character," and then choose whether you would like to create a male or female character.
Choose the body type that you would like your character to have from the ones provided by the avatar creator, and then choose the skin tone that you would like your avatar to have.
Click the right arrow to move on to choose your avatar's hair. Go ahead and scroll through the hair options and click the one that you like best to apply it to your avatar, then you can choose the color of that hairstyle using the sliding color scale just below the style options.
Click the right arrow again to move on to your choices for your avatar's eyes. Click on the eyes that you would like your avatar to have in order to select them. By continuing to click on the right arrow, you will give your avatar the eyebrows, nose, mouth and clothing styles you want. Once you have done the pants and shoes, your "Simpsons" avatar is complete.
Click the right arrow again to move on to changing the color of your avatar's shoes and pants. Click on the pants and then select a color for your avatar's pants using the color scale. Then click the shoes and choose a color for your avatar's shoes using the color scale.