User Variables And SQL Agent - Jobs - Set Values

From the microsoft technet How to: run a package using a SQL server agent job (http://technet.microsoft.com/en-us/library/ms139805.aspx):

Click the Set Values tab to map properties and variables to values.





Note:

The property path uses this syntax: Package<container name>.<property name>. Depending on the package structure, a container may include other containers, in which case nested containers are separated by a back slash (). For example, PackageMyForeachLoopMySequenceMyExecuteSQLTask.Description.

If this is the syntax for writing the container.property value, how do you write the variables?