Currently im having trouble with some stuff, what is the port and what is the ip for ios users?

So I've played on this server for a while but about a year ago or maybe longer when I was very active, I logged in and I couldn't use any commands even /spawn and /balance, so I joined back today and I still can't so I don't really know what the issue is. If someone could help I'd greatly...

WHERE IN THE WORLD IS THE PRINCIPLE?! I've been lookin' everywhere 0_0