"duracağın yeri bilmiyorsun, içme" dedi kadın. "
döneceğin yeri bilmiyorsun, gitme" dedi adam

The woman said, "If you don´t know when to stop, don´t drink"

(it could also be don´t smoke, but I thought don´t drink was more appropriate)

The man said, "If you don´t know the place (or point) where you should turn back, don´t go."

There are no ifs in those sentences Marion. Look at carefully.

You´re right .....!

Thanks, I´ve been struggling without my glasses today

You don´t know when to stop: don´t drink

You don´t know when to turn back: don´t go