IOS App. Unable to specify IP address of server

My setup is where the wireless network subnet is separate from the wired (ethernet) network. The Volumio server is on the ethernet one. Works great. The IOS app cannot find see it though. I have ubuntu server running bind but I’d prefer not to get into that if I can avoid it.
I know the IP. I would like to tell the Volumio IOS app that IP. Perhaps a configuration option?
I can see the wired network from the wireless but the app can’t search it as far as I know.
volumio.local are not assigned.

Cheers,
b

You would be best served by addressing this question at the app author.

Got it. Wrong forum.