how to edit connection manager variables

Hi All There is a package that started to fail. The connection manager has a function sign on it. In the expressions i have two expressions @[$Package::Database] @[$Package::Server] which when i evaluate is showing the wrong server and the wrong database name and hence the package is failing I never worked with variables, can someone please tell me where to go to edit these variables? Also when i click on the variables icon i do not see these variaables can someone please suggest as to from where they are pushed ? Thanks SSIS