If you are using the online version there will not be an icon on your computer, you simply log into your online account with TurboTax and start your return. You will be prompted at the end, just before Netfiling to pay.
Link to sign in at the top right corner of the screen here: https://turbotax.intuit.ca/tax-software/index.jsp
If you have purchased the downloaded version of the software, you will then see the icon on your desktop, which you pay before you can use the software. It will provide you with a 21 digit IKC once purchased via email.
Link to purchase the downloaded version here: https://turbotax.intuit.ca/personal-tax-software/download-tax-software.jsp
Link to already purchased software (use the IKC) : https://turbotax.intuit.ca/product/download/index.jsp