Locking lets you protect items and content from accidental changes. You can do the following:

• To prevent an item’s size and position from being changed (and to prevent the item from being deleted), check Item > Lock > Position.
• To prevent an item’s contents from being edited, check Item > Lock > Story or Item > Lock > Picture.

To unlock selected items, uncheck the appropriate option in the Item > Lock submenu. Alternatively, choose Item > Modify and click the lock icon next to a field.