Unlike others I'm not going to hide things from you here. It's up to you if you want to use the referral part, I'm hoping you appreciate me being upfront enough to. If you choose not to their site will assign you to a random someone as a referral instead.
 
Either one you can sign up with no deposit/investment.
 
http://doge.cryptopyramid.com/?ref=153
http://cryptopyramid.com/?ref=1158
 
Good luck.