Not built yet. Your devices are managed from Pinmesh on each machine — open it there and the list is the first thing on the screen.
On Windows, the icon in the notification area opens it. On Linux and Android, the app itself. Every machine shows the same list, because the list comes from the same directory this site runs.
Signing in also happens there rather than here — the machine has to be the thing that signs in, since it is the machine that joins the network. Signing in on the web exists for the one case that needs it: a machine with no screen of its own.
