You've followed a link to a Gemini server not hosted by nytpu! I mirror my own Gemini content to the web to make it easier for people to enjoy it, but many capsule owners do not want their content accessible over the regular web. If you want to browse the rest of Geminispace, you'll have to use a client explicitly made for Gemini. There's a huge range of clients to choose from for all major platforms, including Android and iOS. I can personally recommend Lagrange for desktop computers (all operating systems) and Ariane for Android. I don't have an iphone, but I've heard Elaho is good.