The ROSA software is an on-line registration process available on the website of the Department of International Relations and Cooperation.  The address is
http://www.dfa.gov.za/consular/index.html

Direct link to registration page:

https://www.foreign.gov.za/TIBCO%20iProcess%20Client%20(ASP)/StaffDFA/Custom/ROSA/start.aspx

Click on the link and follow the easy steps.