Got $5000 in referral credits but didn’t get any forms. Where would i enter this?

[MaryK1]

You can enter this as Miscellaneous Income. 

If you did not receive a 1099-misc or W-2, then you can report this as miscellaneous income.

Select Federal Taxes, Wages & Income, I'll Choose What to Work On

Scroll to Less Common Income, and select Miscellaneous Income, 1099-A, 1099-C

Select Other Income not already reported on For W-2 or for 1099

Select Yes

Continue until you see Any Other Earned Income, and select yes, now on the next screen select other

Complete the information

[seanpd99]

When I do that it says I don't owe any taxes.

[MaryK1]

If that is your only income, you would not owe tax.  
If it is self-employment income- Type Schedule C in the Search box and then select the Jump to link. This will take you to where you can enter any cash, personal checks, credit card payments, or cryptocurrency (Form 1099-K) related to your self-employment. You may first be asked some general questions about your business. After you answer them, you’ll be taken to the Let's enter the income for (your line of work) screen where you can enter this income as Other self-employed Income.