Hi,
There is no need of any particular format for it. You just open the CIC website, click "Check your application status", follow the instructions and you reach the ECAS. Go to the Contact us, which take you to the page for choosing your Visa Processing Office. Once you get this page of the visa office, you will reach the Case specific inquiry where you give your details and message in the space provided. You can also upload any scanned copies of certificates or documents also here, if necessary.