title: How can I edit the embed when the user reacts? JDA
body: <p>When the user reacts, I want to edit the embed to insert the user's nickname into a field.
  So I tried to use the onGuildMessageReactionAdd method but it failed. Is there a way?</p>
  <pre><code>  @Override
      public void onGuildMessageReceived(GuildMessageReceivedEvent event) {
          String[] args = event.getMessage().getContentRaw().split(&quot; &quot;);
          String UserName = Objects.requireNonNull(event.getMember()).getNickname();
          TextChannel textChannel = event.getGuild().getTextChannelById(SendChannelId); 
          if (args[0].equalsIgnoreCase(prefix + &quot;test&quot;)) {
              EmbedBuilder embed = new EmbedBuilder();
              try {
                  embed.setTitle(args[1], &quot;&quot;);
              } catch (ArrayIndexOutOfBoundsException e) {
                  embed.addField(&quot;testField&quot;, &quot;testField&quot;, false);
                  embed.setFooter(&quot;test&quot;, Objects.requireNonNull(event.getGuild().getOwner()).getUser().getAvatarUrl());
                  event.getChannel().sendMessage(embed.build()).queue();
                  embed.clear();
                  return;
              }
              embed.addField(&quot;...&quot;, UserName, false);
              embed.addField(&quot;...&quot;, &quot;&quot;, false); //I want to edit this field!
              embed.addField(&quot;...&quot;, &quot;&quot;, false); 
               try {
                  embed.addField(&quot;...&quot;, args[2], false);
              } catch (ArrayIndexOutOfBoundsException e) {
                  embed.addField(&quot;...&quot;, &quot;...&quot;, false);
              }
  
              embed.setColor(Color.CYAN);
              embed.setFooter(&quot;test&quot;, Objects.requireNonNull(event.getGuild().getOwner()).getUser().getAvatarUrl());
              Objects.requireNonNull(textChannel).sendMessage(embed.build()).override(true).queue(message -&gt; {
                  message.addReaction(&quot;minn:&quot; + emoji1).queue(); //When User react to this emoji
                  message.addReaction(&quot;minn:&quot; + emoji2).queue();
                  temp.push(message.getId());
                  target.put(event.getMember().getUser().getId().hashCode(), temp);
                  keySet = target.keySet();
  
              });
              embed.clear();
          }
  '''
  </code></pre>