No, I?m sorry, for now I just need to know how to add checkbox obligatory to check into post page: http://www.lavorohotel.net/post/

Here are the changes you have to do in order to make those checkboxes mandatory:

in _templates/page_write.tpl on line 164 add this (you have the code already, but I don't know if it's quite the same):

<fieldset>
                    <legend>Privacy</legend>
                    <table border="0" cellspacing="2" cellpadding="2">
                    <tr>
                        <td class="publish-label">privacy:</td>
                        <td>
                            <input {if $errors.poster_check}class="error"{/if} type="checkbox" name="poster_check" id="poster_check" {if $smarty.post.poster_check neq '' || $job.id || $smarty.session.later_edit}checked{/if} value="1" />
                            <span class="validation-error">{if $errors.poster_check}<img src="{$BASE_URL}img/icon-delete.png" alt="" />{/if}
                        </td>
                        <td>inserisci il link qui</td>
                    </tr>

                    <tr>
                    <td class="publish-label">privacy_1:</td>
                    <td>
                        <input {if $errors.poster_check1}class="error"{/if} type="checkbox" name="poster_check1" id="poster_check1" {if $smarty.post.poster_check1 || $job.id || $smarty.session.later_edit}checked{/if} value="2" />
                        <span class="validation-error">{if $errors.poster_check1}<img src="{$BASE_URL}img/icon-delete.png" alt="" />{/if}
                    </td>
                    <td>inserisci il link qui_1</td>
                    </tr>
                    </table>
                </fieldset>

In the same file, below this, you must have:

if (BrowserDetect.browser != "Explorer")
                {
                    $("#publish_form").validate({
                        rules: {
                            company: { required: true },
                            title: { required: true },
                            description: { required: true },
                            poster_email: { required: true },
                            poster_check: { required: true },
                            poster_check1: { required: true }
                           
                        },
                        messages: {
                            company: ' <img src="{/literal}{$BASE_URL}{literal}img/icon-delete.png" alt="" />',
                            title: ' <img src="{/literal}{$BASE_URL}{literal}img/icon-delete.png" alt="" />',
                            location: ' <img src="{/literal}{$BASE_URL}{literal}img/icon-delete.png" alt="" />',
                            description: ' <img src="{/literal}{$BASE_URL}{literal}img/icon-delete.png" alt="" />',
                            poster_email: ' <img src="{/literal}{$BASE_URL}{literal}img/icon-delete.png" alt="" />',
                            poster_check: ' <img src="{/literal}{$BASE_URL}{literal}img/icon-delete.png" alt="" />',
                            poster_check1: ' <img src="{/literal}{$BASE_URL}{literal}img/icon-delete.png" alt="" />'
                        }
                    });   
                }

After that you must open page_write.php and on lines 76 and then 145 add:

    if (!isset($poster_check))
        {
            $errors['poster_check'] = $translations['jobs']['poster_check'];
        }
        if (!isset($poster_check1))
        {
            $errors['poster_check1'] = $translations['jobs']['poster_check1'];
        }

In translations.ini, somewhere after line 31 add:
poster_check = "Error"
poster_check1 = "Error"

Good luck!