In order to verify your amazon account you need to submit your amazon profile link, which is under your account→ see all account → your profile. Also this is only possible in a web browser not the app.
This link will take you directly to your account screen (if you are not logged in please do that first in your browser).
Note : This set of instructions work only in the browser and not in app.
To view profile click on the 'Log in' icon.
Tip: paste the copied link into another tab of the browser to know if the link works