You don't need to do anything. The pin is mailed after you reach the $50 mark. I think the pin is on the way and you'll receive it in a few days!
If you reached $50 mark recently (like few hours ago) then it may take 4-5 business days for them to dispatch it and Action Required link to appear on your account page.
It took me 10 days to get my pin mailed to me. So wait... PIN is used by google to verify your address.
No worries if you don't click yourself! Sometimes I even got a 50+% CTR..Because it gets around 20 visits per day.
Its normal for low traffic sites to get high ctr on a specific day. You dont have to worry if you didn't click youe own ads. However it is against google TOS to tell anyone else about ur CTR, eCPM or no of clicks.
You just have to wait once they will send the pin you will recieve a email that pin was dispatched.. Saad