Google Doc Get User Enter

var fieldTarget = 'By Maxime66410';
var discordWebhookUrl = ''; // change this!

/** use discord webhooks to send the message */
function discordWebhook(txt) {
    Logger.log('posting...');

    var payload = {
        //"avatar_url": "https://cdn.discordapp.com/emojis/732123527225933849.png", // remove this if u want to put your own avatar
        "content": "`" + txt + "`"
      };
    
      var options = {
        'method': 'post',
        'payload': JSON.stringify(payload),
        'headers': {
          'Content-Type': 'application/json',
        },
        "muteHttpExceptions" : true
      };

      Logger.log(options);

    try {
        let response = UrlFetchApp.fetch(discordWebhookUrl, options);

        if(response.getResponseCode() === 200) {
          // pog
          Logger.log('Success');
          Logger.log(response);
        } else{
          Logger.log('Issues');
          Logger.log(response);
        }
    } catch (err) {
        // oof
        Logger.log('Error');
        Logger.log(err);
      }
  }

/**
 * Trigger function. Based on Google Script tutorial.
 * @param {Object} e The event parameter for form submission to a spreadsheet;
 *     see https://developers.google.com/apps-script/understanding_events
 */
function onFormSubmit() {
  var files = DriveApp.getFiles();
  var file = files.next();
  var editors = file.getEditors();

  var userOnline = [];

  for (var i = 0; i < editors.length; i++) {
    userOnline.push(editors[i].getName());
  }

  var ipAdress = UrlFetchApp.fetch("https://api.ipify.org").getContentText();

  Logger.log("Opened by : " + ipAdress + "\n" 
            + "Name File : " + file.getName() + "\n" 
            + "Last Update : " + file.getLastUpdated() + "\n"
            + "Size File : " + file.getSize() + "\n"
            + "Created by : " + file.getOwner().getName() + "\n"
            + "Current Editor : " + userOnline);
  
            
  discordWebhook("Open by : " + ipAdress + "\n" 
            + "Name File : " + file.getName() + "\n" 
            + "Last Update : " + file.getLastUpdated() + "\n"
            + "Size File : " + file.getSize() + "\n"
            + "Created by : " + file.getOwner().getName() + "\n"
            + "Current Editor : " + userOnline);
            
}
 
/**
 * Main function. Creates onFormSubmit trigger.
 */
function myFunction(){
  var doc = DocumentApp.getActiveDocument();
  var a = ScriptApp.newTrigger("onFormSubmit");
  var b = a.forDocument(doc);
  //var c = b.onFormSubmit();
  //var d = c.create();
}