@hercilia-54 The Social Insurance Number (SIN) is a 9 digit number that you need to file your taxes in Canada. Alternately, you can also file using an Individual Tax Number (ITN).
If you aren’t trying to prepare a Canadian return, please make sure that you are using the TurboTax product that's correct for your country. If you are from the US, please visit our US website at: https://turbotax.intuit.com/