how you can change Magento Core API settings?

To change Magento Core API settings, you have to

• Go to Admin menu, choose System –>Configuration
• Select Magento Core API on the left side of the Configuration Panel, under Services
• Tap on to expand the General Settings section and you can
• Type the name of the Default Response Charset that you want to use
• Determine the Client Session Timeout in seconds
• Click the Save Config button when complete