hum, I assume you mean you are using a Pi Zero W and it can't connect? that wouldn't be surprising since I doubt the custom image provided by Adafruit was rebuilt recently. In fact the link above does not even note any compatibility with the Zero, let alone the Zero W.
As for the touchscreen, I'm not sure, it could too be related to the custom kernel not being suitable for the Pi Zero W.
... I would try with a Pi 2 or 3 (or B+) to ensure the screen function properly if you can. But failing that, besides contacting Adafruit, or getting your hand dirty trying to build a custom kernel it's likely going to be a stumbling block.