Sign up to the site - Click on the 'sign up' link at the top right of the screen to go to the sign up page. We won't be using any of your information outside the site, the main reason for the sign up step is to prevent spammers abusing the site, but you also get some useful features when you sign up, such as page notifications etc.
Navigate to the page about your car.
Click on the 'Edit' button, which is at the top mid-right of the page.
Once you have made your changes, don't forget to click on 'Save'.
Done!
For more detailed instructions and information about the site, see the Site Overviewpage