As far as I know, if you don't have blog, the only way to promote DTF is to offer incentives in forums and ask members to join and tell them you will pay 25 cents when they get first payout. But I'm not sure if it will really work, because most of the members will ask 25 cents just for sign up. Anyway, Moustafa said we should try to promote, there is no compulsory to get referrals. So you don't need to worry even if you don't get a referral. Just try your best. Of course, you can also post about DTF in online earning community of facebook or orkut.