https://www.ecocitycraft.com/forum/threads/cant-connect-to-server-solution.146593/ This will tell you how to change versions we are currently on 1.9.2 I believe
Yes @MerrickKing, today we updated to 1.9.4 but it turns out that mojang really bungled everything. All sorts of issues occurred and so we went back to using version 1.9.2 until the issues are fixed. Ryan's tutorial on how to change what version you're playing will help you out. It's very simple, even I can figure it out