How to Become a Secret Agent

To become a secret agent, you have to be at least 30 days old. When you are this age, click on the 'm' in the top right-hand corner of the screen. Click become a secret agent, then click your mission. Click on the rewards, then continue and finally click 'yes' to taking the challenge.
Now click on these to get the right answers:

Q1. Honest
Q2. Being mean or rude
Q3. Report them
Q4. Saying their address
Q5. I want to keep club penguin safe
Q6. I want to help other penguins

Then click done, then hopfuly, when you log back in to CP, you will be a secret agent. It works for me!