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If the 1099-K is for self-employment income, and you can't get it to link to your Schedule C, you should delete the entry and enter it directly in the self-employment income section.   You may have it entered more than once also.    Use the instructions below to delete the 1099-K(s) and then use these directions to re-enter the 1099-K directly on Schedule C.    If you use the self-employment entry, you get the screen below, and you won't need to link it.  

How to delete forms in TurboTax Online

How to delete forms in TurboTax Desktop