How do I turn off push notifications?

Open Settings and switch off Push Notifications. That one toggle covers everything Multiverse Explorer sends — announcements, friend activity from The Nexus, and account activity alike — there's no separate switch to hunt down for each kind.

On by default

Push notifications start on for a new install. Turn them off any time from Settings, and back on again just as easily.

Tap to go straight there

A notification you do get opens directly to whatever it's about — a friend request, a finished unlock — rather than just launching the app to its home screen.