You cannot submit an I-290B to appeal a decision by a CO at a foreign consulate. I think you have to start again.
Form I-290B, Notice of Appeal or Motion (uscis.gov)
Who May Not File Form I-290B?
1. If you are the beneficiary of a petition or an attorney or accredited representative of the beneficiary, you MAY NOT file an appeal or motion unless otherwise instructed by USCIS and as specifically permitted by law. Only an applicant or petitioner may file an appeal or motion. Similarly, an attorney or accredited representative MAY NOT file an appeal or motion on the behalf of a beneficiary.
2. Do not use this form to file an appeal with the Board of Immigration Appeals (BIA). The BIA has jurisdiction over appeals of Form I-130, Petition for Alien Relative, and Form I-360, Self-Petition for a Widow(er) of a U.S. Citizen. You may file an appeal with the BIA using Form EOIR-29, which is available at the USCIS website at www.uscis.gov/eoir-29 and at the Department of Justice website at www.justice.gov/eoir/list-downloadable-eoirforms.
3. Do not use this form to appeal the denial of a U.S. visa application by an overseas Department of State consular officer (for example, Forms DS-156, DS-156E, DS-156K, DS-117, DS-157, DS-230, or DS-260). For information about U.S. visa application denials, visit the Department of State website at http://travel.state.gov/content/visas/en/ general/denials.html.
4. Do not use this form for appeals of Special Agricultural Worker or Legalization applications. You must file these appeals on Form I-694, Notice of Appeal of Decision Under Sections 245A or 210 of the Immigration and Nationality Act. Form I-694 is available at www.uscis.gov/i-694