Somebody can tell me in detail?

How to replace autotransmission fluid for my integra ls auto?

Well, you didn't say what year you have...but here's the link to the
Helm's manual for G2 Tegs. The process should be the same anyway
for other years, but maybe the parts are in a slightly different spot.

Click here for the manual (http://www.ultraimports.com/manuals/9093integra/)

I think 14 is for Auto Transmissions, but not sure if it explains fluid in there.

1997 integra ls auto transmission

ahhh....again, the parts might be in a slightly different spot, but I can't
see the methods being any different.

good luck!