not 100% sure about the civic, but if you do have a filler bolt, it should be stamped ATF right on the nut. I had a haynes for my accord and it too didnt tell me where. I had to look for it. On my accord it is near the top of the tranny case.

also, use the dipstick to check the fluid level, like it says in the manual b/c i inadvertently overfilled mine last time.

-cl206