Will my UI elements work with just a Network Manager?

Before I upload another build to my test site, I was just wondering will my UI elements appear on everyone who is playing the game at that time's screens? Seems to simple to be true that I could just add a network manager script and that's what'd happen so just wanted to see what else I'll probably have to do. I ask because I could only find documentation for gameobjects.

Also, the network address is localhost and the port just the default number I presume. Would this work? Thinking I would need to change it

 

As far as I know, UI elements are as much GameObjects as other objects are, so yes the UI objects should be visible to clients as they are in the scene when it starts. If you change them when the server is running though, then you'd have to do some networking.