Use the config parameter with sp_replication_path to set parameter values in alternate replication paths.
You can change only the password and user ID for alternate replication paths.
sp_replication_path dbname, 'config', "path_name", "config_parameter_name", "config_value"where config_parameter_name is rs_username or rs_password.
sp_replication_path pdb, 'config', "pdb_1", "rs_username", “RS1_user”
sp_replication_path pdb, 'config', "pdb_1", "rs password", “january”