go here to find the settings page you want to access:
https://developer.android.com/reference/android/provider/Settings
the action settings are constants, you need to use their respective string meaning for b4a. click on the name to find the string. that's what you use. eg:
public static final String ACTION_WIRELESS_SETTINGS -------> "android.settings.WIRELESS_SETTINGS"
then add this b4a code:
Dim SettingsIntent As Intent
SettingsIntent.Initialize("android.settings.WHICHEVER_SETTING_YOU_CHOSE", "")
StartActivity(SettingsIntent)