The GUI you created really isn't worth it. Simply world 1 or world 2 buttons that set the ip would work IMO.
Displaying the world selection as buttons wouldn't work out, if the world numbers increase, we'd have to add more buttons (thus overflowing the GUI, so it's pretty much messy)
Displaying the world selection as a list is much neater as you can scroll to navigate the list and select your world efficiently.
Also, display the worlds as buttons will refrain the users from choosing which detail to open the client in.