I am a Xcode newbie, please help.
So I know how to change the text in Label box by with a text field:
self.textLabel.text = self.textField.text
The quest
You need to concatenate 2 Strings. Here are some clues:
Shortcuts in Objective-C to concatenate NSStrings
Concatenate String in String Objective-c
Simple string concatenation in Objective C
So:
self.textLabel.text = [@"Hi" stringByAppendingString: self.textField.text]
or
[textLabel setStringValue: [@"Hi" stringByAppendingString: self.textField.text]];