If you are a U.S. citizen or a Greencard holder, you will need to provide your SSN/ITN number for tax compliance purposes. You can enter it into your profile under the ‘SSN/ITN declaration’ option in the ‘Account details’ section.
To do this, follow these steps:
1. On the app’s home page, select your avatar or photo to go to your profile.
2. On your profile page, select 'Account details'.
3. On the page that opens, go down to the end of the page and select ‘SSN/ITIN Declaration’.
4. Then enter the SSN/ITN number in the relevant field and select save.
5. Upon successful completion of the process you will get the following image and you will have completed the process.