After i upgrade the moodle sysytem im getting ( moodle appliance - Powered by TurnKey Linux ) message in the middle of the page . how can i place it on appropriate place ?
Ok - those strings aren't in core Moodle so how did they get there? It implies that you downloaded Moodle from somewhere other than moodle.org. This is not recommended.
The solution is probably to replace your Moodle code with the "official" version but it's hard to give better advice until we know what you did.