@mrmarkuz
Well ok your help is very useful i have finally digged the docs .
- Admin user has write acces you can add user groups and link them
- Any other user has not write power so you have to deal with ACL
- Looking at the doc http://docs.nethserver.org/projects/nethserver-devel/en/v7/nethserver-directory.html admin seems disabled(instead enabled by default)
the only way to deal with is
ldapmodify -Y EXTERNAL <<EOF dn: olcDatabase={2}hdb,cn=config changetype: modify replace: olcRootDN olcRootDN: uid=administrator,ou=People,dc=directory,dc=nh EOF
Infos about ACL are here.
another idea is to follow this