Sorry—I misunderstood your question earlier and thought you were having trouble accessing the Keychat website.
Were you adding an NWC Lightning wallet or an ecash wallet on the Keychat wallet page?
If you added an NWC Lightning wallet, it can’t be automatically used for stamps yet (sorry—our wording wasn’t accurate). If you added an ecash wallet, it should be used as the stamp source automatically. You can try restarting Keychat.
Looking forward to your further feedback.
