Why It's hard to rent referrals after upgrading in Neobux?

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Last Wednesday, I upgraded my Neobux account to Golden Member. I have 200 rented referrals before I upgrade my account. But now I'm going crazy about this renting referral thing. It says that I have to set my personal setting hours to rent. And now, I'm running out of time because I don't know what time can I rent referrals. I set it 10(8 your time) and 12(10 your time). But still I can't rent referrals. It's to hard to rent now. I wish I've rented more when I was a standard member.