you can have it resealed with
1 a new pan gasket
2 permatex no.2 sealant on the edges only
ATF is added from the dipstick tube itself,
you would need a long type funnel, I use an old empty silicon sealant cartridge with a funnel on top, always add trans fluid to a started engine and check by rowing through all the gears - and checking the fluid level once back in Park, it should never ever be overfilled.