Having new users to sign up under your Referral on a website has always been a challenge for us. Some people might not be interested in registering on a website so how do you manage to get Referrals ?
The first method to get referrals is to convince your real life friends to sign up under your referral because in them you can put your trust that they will do what you will ask them to. Try explaining them the advantages they get by signing up on the website you suggest them. I know it sound kind of lame to try to convince people to do something they might not be interested in, but that's how things are.
A second method to get referrals is to make a website or blog and also try to present to your visitors how good is the website you want them to sign up under you.
Another method is to pay users to sign up under your referral using micro jobs websites like Minute Workers. Exchange of referrals is also a good tactic. It's better to vary your sources in order to get new referrals. It's better if you get at least one referral that is active all the time rather then 20 inactive.