want to change sub domain and domain names

want to change sub domain and domain names, to access my site, use the ip with https://

domains/mathcentral.is-not-a.dev.json

@@ -1,7 +1,7 @@
 {
     "description": "A website where you can play html games.",
-    "domain": "localplayer.dev",
-    "subdomain": "nexus",
+    "domain": "is-not-a.dev",
+    "subdomain": "mathcentral",
     "owner": {
         "repo": "https://github.com/nexus4212/nexus",
         "email": "nexushub4201@gmail.com"
@@ -12,4 +12,4 @@
         ]
     },
     "proxied": true
-}
+}