Where to submit ID Proof?


I submitted my first article yesterday. After waiting almost 24 hours received this message - 

"Before moving forward, we were unable to verify your ID. Please resubmit after uploading a scan of a valid photo ID at the bottom of the contributor details page, which is found in your settings menu."

Now I have been searching all this while for where to upload the Photo ID document, from 'contributor detail' to 'settings' page, but for the life of me couldn't fine. Any help, regarding the specific location where this ID proof needs to be submitted will be hugely appreciated.