A co-signer is the spouse of an applicant who initiated an Income-Driven Repayment Plan Request
Are you a co-signer on an IDR plan?
no, but I might be
what will I need if I'm ready to co-sign?
If the IDR applicant completed an Income-Driven Repayment Plan Request that was not part of a Direct Consolidation Loan Application, he or she will click on "Income-Driven Repayment Plan Requests" under "My Loan Documents" to locate and provide you with the Reference Number you need.
what if it is a direct consolidation loan?
If the applicant  completed an Income-Driven Repayment Plan Request as part of a Direct Consolidation Loan Application, he or she will click on "Direct Consolidation Loan Applications" under "My Loan Documents" to locate and provide you with the Co-sign Code you need.
and it is the same place to sign in for both?
Yes, you log in to the Co-sign Income-Driven Repayment IDR Plan Request
can either one of us do it?