You can get paid through paypal, payza, perfectmoney and Solid trust pay. you can request payout when you reach minimum 1 $
This happened when you submitted an invalid account id
Yes, you have to click 4 advertisement in order to earn from your referrals the next day.
No,you do not have to invest in order to get paid.
In order to find your referral link you have to go to your account and then on the left menu click on "Banners".There you will find everything you need in order to promote your referral link and get direct referrals.
You have to deactivate adblock from your browser settings.