Probably not found.
There is currently no official news that this function has been cancelled, so if you can't find it, or you haven't found the correct entrance to Quick Chat, there is a problem with the software, and you need to reinstall it.
1. Open the Momo app, enter the homepage, click "Message" in the bottom menu bar, and find the message box of Kuaichao.
2. Click "OK" according to the prompt that pops up from the system, and then point your face to the phone camera, and the system will automatically match.