When you are in the Service Contacts of a case, one of the options listed under the Add button is the Public List.
The Public List option is the only method that should be used to add an opposing counsel. You can search for an attorney here using their name. The email address associated with that attorney is what the State Bar has in their system.
You cannot add non-attorneys this way. If a non-attorney is not already listed in the service contacts, you will need to e-serve them through traditional methods (like adding them to your Firm Service Contacts list or by adding them to the case's Service Contacts list as a new contact, if applicable in your state).
For Most States:
For Louisiana & Illinois: