pp3/module/Application/view/application/admin/edit.phtml

<?php
/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
?>
<h3>Edit Plugin</h3>
<?= $this->partial('layout/flash.phtml'); ?>
<div class="">
    <ul class="nav nav-tabs" role="tablist">
        <li role="presentation" class="<?= $this->activeTab == 'settings' ? 'active' : '' ?>"><a href="#settings" aria-controls="settings" role="tab" data-toggle="tab">Plugin Settings</a></li>
        <li role="presentation" class="<?= $this->activeTab == 'authors' ? 'active' : '' ?>"><a href="#authors" aria-controls="authors" role="tab" data-toggle="tab">Authors</a></li>
    </ul>
    <div class="tab-content">
        <div class="tab-pane panel panel-default <?= $this->activeTab == 'settings' ? 'active' : '' ?>" style="padding: 2ex 1ex" role="tabpanel" id="settings">
            <div class="row">
                <div class="col col-sm-6">
                    <form method="post" action="" class="needs-validation" enctype="multipart/form-data">
                        <?= $this->partial('application/plugin/_plugin-form.phtml', array('plugin' => $this->plugin, 'categories' => $this->categories, 'imageTypes'=>$this->imageTypes, 'editMode' => true)); ?>
                        <a class="btn btn-secondary" href="<?= $this->url('admin') ?>" role="button">Return</a>
                        <button type="submit" class="btn btn-primary">Save Plugin</button>
                    </form>

                </div>
            </div>
        </div>
        <div class="tab-pane panel panel-default <?= $this->activeTab == 'authors' ? 'active' : '' ?>" style="padding: 2ex 1ex; position: relative" role="tabpanel" id="authors">
            <div class="row">
                <div class="col col-sm-6">
                    <h4>List of authors</h4>
                    <table role="presentation">
                        <?php
                        foreach ($this->plugin->getAuthors() as $author) {
                            printf('<tr><td>%s (%s, %d)</td><td><form method="post" action="" enctype="multipart/form-data" style="display: inline-block; margin-left: 1ex"><button class="btn btn-default" role="button" name="removeAuthor" value="%d"><i class="fas fa-trash text-danger"></i></button></a></form></td></tr>',
                                    htmlspecialchars($author->getName(), ENT_COMPAT, 'UTF-8'),
                                    htmlspecialchars($author->getEmail(), ENT_COMPAT, 'UTF-8'),
                                    $author->getId(),
                                    $author->getId()
                            );
                        }
                        ?>
                    </table>
                    <h4>Add author</h4>
                    <form method="post" action="" enctype="multipart/form-data" style="display: inline">
                        <div class="form-group">
                            <label for="urgroupIdl">E-mail</label>
                            <input type="text" class="form-control" id="addUserByEMail" name="addUserByEMail" placeholder="Please enter e-mail" value="" >
                        </div>
                        <a class="btn btn-secondary" href="<?= $this->url('admin') ?>" role="button">Return</a>
                        <button type="submit" class="btn btn-primary">Add author</button>
                    </form>
                </div>
            </div>
        </div>
    </div>
</div>