Make sure this shared library resides on the same server computer on which the Sun Java System Directory Server is installed.
Make sure you know the Directory Manager password.
Modify the libdigest-plugin.ldif file changing all references to /path/to to the location where you installed the digest plug-in shared library.
To install the plug-in, type the command:
% ldapmodify -D "cn=Directory Manager" -w password -a < libdigest-plugin.ldif