How can I fix my federal tax return that was rejected because I can’t find the section where I can check off that I can be claimed as dependent on another return file?

F1040-516-01 - If Form 1040, 'PrimaryClaimAsDependentInd' is not checked, then 'PrimarySSN' must not be the same as a Dependent SSN on another return filed for the same tax year. I understand the problem but can’t find the section where to fix this.