You would want to contact the CRA to see what form you need to submit. I suspect they will just have you adjust Canadian return to add it. If you are in Canada or the United States, you can call the CRA at 1-800-959-8281. This page has more ways to contact the CRA: Contact the Canada Revenue Agency
TurboTax software will make you fill out an entire tax return, so if you need to use just one form, you'd be better off downloading it from the CRA website.