The same way they support liars, idolaters, fornicators, thieves, and any other sinner.
With love, providing God’s word, and showing them the error of their ways - having them pray, repent, and as someone much greater than I said “Go and sin no more”.
Homosexuality is no greater, or lesser, sin than any of the others listed, and more beside.
You did read the part about ordaining homosexuals and performing homosexual marriages, right?
Do you put a thief in charge of the offering? A fornicator to do home visits of widows?