You can change the properties of existing items in table or yes/no user-defined fields. For yes/no user-defined fields, you can specify one of the items as the default value that is automatically set for the field in all new entries.
In the left navigation pane, click Administration and select Set Up User-Defined Fields.
To search for a field, enter all or part of a field name in the search box and click the search icon.
All matching fields in the list are highlighted, and the number of matching fields is displayed.
Select the table or yes/no user-defined field, and click Items.
Click the name of the item you want to modify.
Modify the properties of the item.
For yes/no user-defined fields, you can select Default value to set this item as the default value for the field.