You probably landed here when going to wireboard.net, which is because the app doesn't have it's own homepage yet. But you are in the right place, here you can download the windows client for Wireboard, which allows you to connect to the Android part of it.
Simply download the installer or archive, install or unzip and start it up. In most local networks, no configuration is necessary and it'll find the phone and connect itself.
If you have issues, questions or found bugs, please use the github issue page to contact me.