I have had no problems in completing this offer the past 5-6 months and I do it nearly everyday.
1) Click on 4 links on the top (Entertainment, Gas, etc)
2) Click on 1 link below that (Should be a box of 3 ads)
3) Wait 3 minutes (180 seconds)
4) Refresh if a and b don't show up after 180 seconds
5) Click a) Some auto thing and then b, then it should say your account has been credited