How do I add a cosigner to my loan? November 12, 2020 00:08 Updated For guidance on how to add a co-signer, contact us via chat or by phone at (855) 456-7634 once you’ve logged in. Related articles How do I add a co-signer after submitting my application? Can I add a co-signer? How long will adding a co-signer to my loan take? Do you require or accept co-signers for Student Loans? What are the advantages and disadvantages of adding a co-signer to my loan?