The Quality Assurance (QA) Competition challenges can include: unstructured testing, structured testing, structured test case writing, and automated testing.
First you must become a Topcoder member and start competing!
The competition is free but you must be a member who is 18 years or older, as well as meet all eligibility criteria, in order to participate.
QA challenges will be counted in the QA track, but will not count towards the Development Track. What is QA at Topcoder? The best place to start is here.