I need payment gateway even though client is login in events+

Hi

I need payment gateway even though client is login in events+

IF client is not login means payment is not showing and if i click on i am attending means then i am getting login to facebook,login to twitter...

But payment button is not visible to me

please check my url

http://howtoupdateiphone.com/events/2013/05/cricket-match-between-hyderabad-and-mumbai/

I need payment button even though user is not registered