Manipulating Ontology[add,remove and Update]

I have made an ontology using Protege and i have inserted 300 instances.I have used two object properties in my ontology i.e isSynonymOf and isAntonymOf . I want to handle my ontology using java Eclipse. I have imported ontology in Eclipse.

• I want to add some instances of a specific class using user input
• I also want to remove existing some instances

• And i also want to edit some individual and properties

  I am beginer in java and do not know how to do it. It might be simple but i am beginer.So sorry in advance

  My initial code is as follows

  public class OntMgt {
  public static void main(String[] args){
  OWLOntologyManager manager = OWLManager.createOWLOntologyManager();
  
  IRI iri = IRI.create("http://word.owl");
  OWLOntology WordOntology = 
  manager.loadOntologyFromOntologyDocument(iri);
  System.out.println("Loaded ontology: " + WordOntology.getOntologyID());
  ConsoleProgressMonitor progressMonitor = new ConsoleProgressMonitor();
  OWLReasonerConfiguration config = new SimpleConfiguration();
  OWLReasoner reasoner = (OWLReasoner) 
  reasonerFactory.createReasoner(WordOntology, config);
  boolean consistent = reasoner.isConsistent();
  System.out.println("Consistent: " + consistent);
  String fileName="C:\Users\Word.owl";
  
  OntModel model =ModelFactory.createOntologyModel(OntModelSpec.OWL_DL_MEM_RULE_INF);
  InputStream in = FileManager.get().open(fileName);
  model.read(in, "");
   System.out.println("model called sucessfully");
    }
   }