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WordPress handles the actual registration so I guess you can disable it within Settings - General.
As for post an ad menu link, you can remove it from WordPress - Appearance - Menus

There was a WordPress issue that caused this (just found out) which is fixed with WP 4.3.1, please make sure you update.

Is this the only site you have? is this a dedicated server? have you talked with your hosting company? I believe this is coming from somewhere else not the theme.

The function is still there, it's just been moved to the customizer section - Appearance->Customize - Site

For more info about the update, see here:...

I found to get the slider "sliding" again, you just need to add auto: true, to the JavaScript


<script>
/* featured listings slider */
jQuery(document).ready(function($) {...