How much federal income tax should be withheld if i made$8262.50, i am filing as single?

If you ar filing single and made $8262, with no other income, you do not have a tax liability.  The standard deduction for Single is $13, 850--so you only pay tax on an amount of income higher than $13,850 if the income is reported on a W-2.

Please be careful when posting. Your question with your specific income is personal information that could be used to steal your identity. 

While the original responder is correct, they should not have repeated this fact in their answer