Perform the following steps:
Right-click on the folder and choose Permissions from the popup menu to display the Folder permissions dialog.
Click on the Owners tab to display the Owners tabbed section.
Click Add to display the Add owner dialog.
Type the name of the user in the Enter user name text box.
Click OK to save your changes and close the Add owner dialog.
Click OK to save your changes and close the Folder permissions dialog.
You can grant different levels of access to the owners. Unless you choose otherwise, the owners can view and edit Public, Private, and Confidential tasks and events for that folder.