Check out the example "GUI Hello World" in the example menu of the IDE (folder "Tutorial"). It is exactly doing what you try to do and nothing else.
Anyway reading the manual and the language reference included in the download (help menu) would be a good start.
I knows that button.title can be changed, how described in "Quick Start" from 22.2.2010. But I will change a label programmatically, eg. label.title or textfield.title or such. The mentioned example "GUI Hello WOrld" changes a button.title and not label.title or such, how I will and I become, for good measure, an error by run this example:
Internal Error. Please report back to us.
In file included from /Users/mac/Downloads/Objective-Basic.app/Contents/Resources/Examples/Subclassing/SubClassNSButton/Build/Release/ObjC/global.mm:1:
/Users/mac/Downloads/Objective-Basic.app/Contents/Resources/Examples/Subclassing/SubClassNSButton/Build/Release/ObjC/global.h:4:17: error: ObjB.h: No such file or directory
/Users/mac/Downloads/Objective-Basic.app/Contents/Resources/Examples/Subclassing/SubClassNSButton/Build/Release/ObjC/global.mm: In function 'void -[global _AwakeFromNib](global*, objc_selector*)':
/Users/mac/Downloads/Objective-Basic.app/Contents/Resources/Examples/Subclassing/SubClassNSButton/Build/Release/ObjC/global.mm:17: error: 'ObjB' was not declared in this scope
compilation terminated due to -Wfatal-errors.
I cannot find where are stored the examples! May be, there are additional files to download with the Objective-Basic.app.zip? Or is any way to "install" Objective-basic, that I cannot find anywhere? Or any publications, that I can read?
The mentioned Language Reference ist only a list of keywords and not a true reference or any way to learn objective-basic.
An last but not least: Why are this forum only in english and not also in german?