Firstly, you will need to create an account on Yahoo!
You will need to get to level 2 to make your links active (clickable). To do this simply answer some questions or answer some popular polls. You will have a limit of 20 answers per day, but it should only take a few days to get to level 2.
Once level 2, you can start answering questions and posting your Adfly links of the sources. Don't go about spamming your links as you'll probably get banned, but posting them when you answer questions will get you some free easy money.
Get started by joining Adfly now.
