Once you sign up and go through phase 1 and 2 of the process, you can re-login to start uploading your documents. 

Click on the KYC Verification Menu Item to begin the process.

Once your logged in you can upload your ID and proof of address. Be sure your documents are valid and within date. ( 3 months from the date you are looking to upload documents. eg : Upload date is 31/03/2018 you cannot upload docs dates before 01/01/2018).