The DN Editor is the default editor for attributes with distinguished name syntax.
The edit dialog looks as follows:
To edit the DN you can use the following options:
You could manually edit the DN in the input field.
You could choose a previously used DN from drop-down list.
By clicking Parent the parent DN of the current DN appears in the input field.
Browse.. opens a DN Selector, similar to the LDAP Browser. You can browse and filter to find an entry. When selecting an entry its DN appears int the input field.