What do you do when your automatic transmission Civic will go forward but will not go in reverse?

If it were my car i would replace the transmission. A website www.car-part.com gives you a list of used parts all over the country. If you are a do-it-yourself-er it is the cheapest way to go.

or

check for cel [check engine light] or for dtcs [diagnostic trouble codes]

if none are present repair or over haul maybe required torque converter is bad.