why is it the my renters credit is not showing at the end of the state return

Can you please clarify for which state?

California

The Rent credit is in the Taxes & Credits section of the CA state return.   The credit is either $60 or $120, so you may be looking at a combined federal and state refund/amount due.   View your CA return to see the amount you owe or the amount of your refund.  

California offers a credit to renters who fulfill all of these requirements:

• Paid rent in California for at least half the year
• Made $52,421 or less (single or married/registered domestic partner filing separately) or $104,842 or less (married/registered domestic partner filing jointly, head of household, or qualified surviving spouse)
• Didn’t live with someone who can claim them as a dependent
• Weren’t given a property tax exemption during the tax year

You’ll get $60 if you’re single or married/RDP filing separately or $120 if you’re married/registered domestic partner filing jointly, head of household, or qualified surviving spouse.

I didn't make any income this year, so I have $0 for everything. However, before I sign to submit my taxes, I need some clarification. Turbo tax showed that I qualify for $60 California Rent Credit, but at the end of my tax form before submitting to IRS, it shows $0 for State refund. The $0 on federal makes sense, but if I'm supposed to get the $60 rent credit, why is my state refund still show as $0 ?

CA renter's credit is a nonrefundable credit. Nonrefundable tax credits can reduce the amount of tax you owe, but they do not increase your tax refund or create a tax refund when you wouldn’t have already had one.