What does “Manage” mean on the Subscriptions screen?

On the Subscriptions screen, Manage means your group already has an active subscription of the correct size.

Tap Manage to view or update that subscription (for example, to change billing details or cancel), depending on whether you subscribed through the App Store or Google Play Store.

If you see Upgrade instead, that group either doesn’t have a subscription, or it needs a plan change. If you see Unassigned, that subscription isn’t currently applied to any group and can be applied using Assign.