Your offer to study can only be accepted online once the Student Enrolment Centre has received the Duly Certified paper copies of the qualifications. As you might recall you uploaded the electronic copies which enable for a decision to be made by the department you have applied into.
Now that an offer is granted we require the duly certified hard copies as per the University Statute before you can accept the offer and subsequently register.
The addresses to which you could send your documentation are:
Wits University - Student Enrolment Centre
Private Bag 4
Alternatively the courier address, which is:
University of the Witwatersrand
1 Jan Smuts Avenue
Student Enrolment Centre
Ground Floor Senate House