update joomla website

I am trying to update joomla website from 1.7.3 version to latest version but I am having some problems :
1) when I click on option button it don't have "Update Source", it only have option of "Permission"
2) when I Select Components from the drop-down menu of the Joomla! Administrator Panel there is no option of Joomla! Update

See original post by sara malik