There is a GUI bug in v1.6 Beta for iOS that causes the Mount Settings window to inherit the wrong window height due to the Tacking menu not taking into account the additional Tracking Rates menu.
As a result, you may not be able to click on GoTo Home Position, which is the last item of the Mount Settings.
The work around is simply to turn Tracking off; this will remove the tracking rate GUI and make the Home selection visible.
Once you tap on the Start button of the GoTo Home Position menu item, ASIAIR would have turned Tracking off anyway, so this workaround will not incur any loss of functionality.
Chen