Xcode 4: How to change ${EXECUTABLE_NAME} variable's value?

I want to find where is ${EXECUTABLE_NAME} global variable defined in xcode 4.2

What is $( Executable_name?

Specifies the name of the binary the target produces.

Where is build settings in Xcode?

Choose the project in the Project Navigator on the left. Select the Configurations target from the Targets section and click the Build Settings tab at the top. The Build Settings tab shows the build settings for the Configurations target. It's possible to expand this list with build settings that you define.

What is Built_products_dir?

BUILT_PRODUCTS_DIR. Description: Directory path. Identifies the directory under which all the product's files can be found. This directory contains either product files or symbolic links to them.

[Your target] -> [Build settings] -> [Product name]