I solved using LDAP commands https://www.linux.com/learn/managing-ldap-command-line-linux.
- Open shell
- ldapmodify -h localhost -x -W -D “uid=admin,ou=People,dc=directory,dc=nh”
- enter admin password
- digit dn: uid=username,ou=People,dc=directory,dc=nh and press Enter
- digit changetype: modify and press Enter
- digit replace: mail and press Enter
- digit mail: address@domain.ext and press Enter
- press CTRL+D to confirm modify
Bye.