A co-signer is the spouse of an applicant who initiated an Income-Based Payment Plan Application.
are you a co-signer?
no
Unfortunately, no relevant information is found.
and who should give me the joint signature code?
The IDR applicant should have provided you with a joint signature code / reference number.
Do you still have knowledge of the Direct PLUS Loan? Is it true that making a request for this type of loan is all there is to it?
Before you can receive the loan you need to complete a direct plus loan master promissory note, which will explain everything of the terms and conditions of this program.
What happens if I have have a security freeze?
In that case, you'll need to remove the freeze at each credit bureau before you can continue.
I see this is on the application you mentioned before?