I wanted to post this because I often see many people who get confused by the DS 3032 (Coice of Address and Agent) and the DS-230 (Part I).
These are documents that must be signed by applicant/beneficiary/immigrant. Not by the petitioner/spouse who is doing the sponsoring.
Don't get confused and think that since you have been selected as an AGENT to receive mail from the NVC, that you can then start signing DS-230 on behalf of your overseas spouse. The DS-230 wants biographic information on the applicant, so they must sign the forms. Your signature would be null and void as heresay.
REMEMBER
Sign documents that pertain to YOU.
A signature is an affirmation or testement that a document is correct.
Signing a document in someone else's name is forgery.