Hey Jennifer, we switched to njump because it is a client agnostic service and we want to highlight the various ways you can access the protocol. Are you on mobile? And if so iOS or android? 

I believe on iOS there are some issues with automatically opening up your native client that nostr:npub10000003zmk89narqpczy4ff6rnuht2wu05na7kpnh3mak7z2tqzsv8vwqk was working on. On Android you should be able to hit "open in native client" and choose amethyst etc.