The code it´s from de backend.
If I delete <!-- --> nothing apears and the code transform in this:
<h3>Install Successful!</h3>
<p>
<span class="modxtag">[!AjaxSearch? &AS_showResults=`0` &AS_landing=`17` &showMoreResults=`1` &moreResultsPage=`17`!]</span>
</p>
<p>
You have successfully installed and configured MODx. We hope you find this site an adequate starting configuration for many small business, organization or personal websites; just change the template and content, and you'll be good to go! This site is preconfigured with a variety of options we hope are helpful, relevant and just plain cool for many marketing or personal sites:
</p>
<ul>
<li><strong>Simple Blog.</strong> When logged into your site, you'll be able to create new entries from the front end. This can also be turned into a News publishing or PR publishing system. <a href="[~2~]">View example blog</a></li>
<li><strong>Easy Comments.</strong> When logged into your site, your registered site users can comment on your posts. <a href="[~9~]">View example</a></li>
<li><strong>RSS Feeds.</strong> Your site visitors can stay up to date using your site feeds. <a href="feed.rss">View RSS feed</a></li>
<li><strong>Automatic User Registration.</strong> Those that wish to comment on blogs must first create an account. This comes pre-configured with a "Captcha" anti-robot registration feature. <a href="[~5~]">View registration form</a></li>
<li><strong>QuickEdit.</strong> When you're logged into the manager, you can edit a page directly from the front end! <a href="[~14~]">More about CMS features</a></li>
<li><strong>Integrated Site Search.</strong> Allows visitors to search only the pages you wish them to search. Uses Ajax to display results without loading a new page. <a href="javascript:void(0)" onclick="highlight('ajaxSearch_input','#ffffff',2000);">Highlight feature</a></li>
<li><strong>Powerful Navigation Builder.</strong> Duplicate or build virtually any navigation system with our dynamic menu builder code. The menu above, for example. <a href="[~22~]">More about menu features</a></li>
<li><strong>Mootools enabled.</strong> You're on your way to Web 2.0 and AJAX goodness. <a href="[~16~]">More about Ajax features</a></li>
<li><strong>Custom "page not found (404)" page.</strong> Help visitors who go astray to find what they're looking for. <a href="[~7~]">View 404 page</a></li>
<li><strong>Contact Us form.</strong> A highly configurable contact form you <em>should</em> customize to point to the right email address. Comes pre-configured to prevent mail-form-injection so your site does <em>not</em> become a source for spam. <a href="[~6~]">View form</a></li>
<li><strong>Newest documents list.</strong> Shows your visitor the most recently added pages (configurable). <a href="javascript:void(0)" onclick="highlight('recentdocsctnr','#e2e2e2',2000);">Highlight example</a></li>
</ul>
<p>
<strong>To log into the MODx Control Panel and start customizing this site, point your browser to <a href="manager">[(site_url)]manager/</a>.</strong>
</p>
Note: I install the last version of MODx from the download page.