The first thing would be use a valid email address. I personally use a Google Mail account for this and I’m satisfied with it because it doesn’t block the messages.
Some of the ptc websites use Paypal. PayPal is another payment processing company owned by eBay. It is used by millions of people worldwide and I don’t think you’ve never heard about it before. If you already have a Paypal account it is ok, you can use it with some of the ptc sites, if not you can use the link below to make an account right now…
Make a PayPal Account
This being said what’s left to do now is - find the best ptc sites and start earning money.