Are you on an IP6 network? Most folk are not so you can ignore that item entirely.
Sharing files on a network varies with which Windows. There are numerous web articles so use ones for your version. And again, it' has never been about IPv6.
Please no judgement, I'm an enormous network noob. With that out of the way, I need to make my desktop PC "discoverable" on my local home network, i.e. be able to share files with another PC or server. However, I noticed under my adapter info that it says IPv6 Connectivity: No Network Access. The motherboard I'm using (ASRock Z97 Extreme4) has no Wifi capability and I'm on a different floor than the network setup, so I'm using a TP-LINK power line adapter. Is networking beyond simple Internet access even possible using one of these adapters, and if so, how can I gain network access? Do I need to make a homegroup (whatever that is)? Again I know very little on the subject so any help is much appreciated. Thanks.