我在09年以綠卡的身份申請我一個21歲以上，未婚的兒子來美國。現在我已經是公民了。我想應該可以將我兒子的申請類別更改到我以公民的身份申請他。但是我不知道怎麽樣才能夠更改。是否可以在網上直接更改？還是要郵寄我的一些材料到移民局更改？
-Has your I-130 been approved? Was the I-130 transferred from USCIS to the National Visa Center (NVC)?
You need to write a letter to USCIS or Nation Visa Center (depends on where your case is) and ask USCIS or NVC to upgrade your I-130 from F2B category to F1 category. Explian you has got the US citizenship and provide the copies of US citizenship certificate and the I-130 approval notice (or I-130 filing receipt).
