Oh I thought you found it, Style Properties -> Login Bar, all the login controls are there. You just need to uncheck "Disable Regular Login"
no its version 1.5.6 . i have only do this
Bildschirmfoto 2016-03-17 um 05.25.17.png

when you login in , there is no logout button on the Top of the right side. i see only the button of the ACP on there place
Oh my... I thought you couldn't see the login link...

By default there's no logout link, it's found in the user dropdown menu. You can try adding this to:

<xen:if is="{$visitor.user_id}">
<li class="navTab customLogout">
   <a href="{xen:link logout, '', '_xfToken={$visitor.csrf_token_page}'}" class="LogOut navLink">{xen:phrase log_out}</a></li>
I could be going crazy but I don't think we had one there. XF did have a logout link a long time ago. My fix was for the visitor tabs, notice the template name.

Pre-Sale Questions

If you have any questions or concerns you want to ask before you make a purchase don't hesitate to use one of our multiple support channels for your convenience.