How do I send an 8862 form when my refund was already processed ?Do I have to amend??

[VolvoGirl]

Do you mean form 8962?  Did you get a letter from the IRS?  

If the IRS is requesting form 8962 see

https://ttlc.intuit.com/community/health-care/help/the-irs-is-requesting-form-8962/00/27409

[DoninGA]

Was your earned income credit (EIC), child tax credit (CTC)/additional child tax credit (ACTC), credit for other dependents (ODC) or American opportunity credit (AOTC) reduced or disallowed for any reason other than a math or clerical error on the 2019 tax return?

[Critter-3]

If you really need an 8862 then you can either use the amendment program to populate the form  OR  manually complete the form :  https://www.irs.gov/pub/irs-pdf/f8862.pdf