If you have bought TurboTax Online, please go to turbotax.ca/activate to use your code before you start your returns. You can see this TurboTax FAQ for step-by-step instructions: In TurboTax Online, how do I use a prepayment code? 

Please keep in mind that the code can only be used once per account. Using the code again will result in an error message. It can only be linked to one account. Additionally, TurboTax Online and TurboTax Desktop codes are not interchangeable. 

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I have already created an account on TurboTax and entered my return info. Now, how can I indicate my Costco purchase to file and submit?

@ssamet1342 

If you have bought TurboTax Do It Yourself (Online), please go to turbotax.ca/activate to use your code before you start your returns. You can see this TurboTax FAQ for step-by-step instructions: In TurboTax Do It Yourself (Online), how do I use a prepayment code? 

If you have bought TurboTax Desktop, you will be asked for the licence code when you install the software. Please see this TurboTax FAQ for more information on the licence code: Where is my TurboTax licence code? You can download the current version of TurboTax Desktop edition here: Choose the current TurboTax Desktop edition you need (for Windows). You can download older versions of TurboTax Desktop edition here: Where can I download the Desktop edition of TurboTax?