Graham filmbokep To show a random post you need to add a blog function with the entries_per_page="500" or more so that there is NO pagination and the script can select a random entry from the whole list it will show a random post every time getting it to just change every hour could require a lot more code (if it is even possible)
Then in the twig file you can test for no paging to output the random post or show a normal blog if entries_per_page < than the total number of posts
The twig code for the entries list could look something like this

{% block entries_list %} <div class="xt_blog_post_list"> {% if data.pagination_html|length %} {% for entry in data.entries %} <div class="xt_item"> <span> <a class="xt_blog_title_link" href="{{ entry.url }}"> <span class="xt_heading">{{ entry.title }}{% if data.entry_list_show_time %} <span class="xt_blog_entry_time">{{entry.created}}</span>{% endif %}</span> {% if entry.comments_count %} <span class="xt_blog_comments_number">( {{ entry.comments_count }} )</span> {% endif %} <span class="arrow"></span> </a> {% if data.display_type != 'header' and entry.content %} <span class="xt_description">{{ entry.content|raw }}</span> {% endif %} </span> </div> {% endfor %} {%else%} {%set entry=data.entries[(random(data.entries|length-1))] %} <div class="xt_item"> <span> <a class="xt_blog_title_link" href="{{ entry.url }}"> <span class="xt_heading">{{ entry.title }}{% if data.entry_list_show_time %} <span class="xt_blog_entry_time">{{entry.created}}</span>{% endif %}</span> {% if entry.comments_count %} <span class="xt_blog_comments_number">( {{ entry.comments_count }} )</span> {% endif %} <span class="arrow"></span> </a> {% if data.display_type != 'header' and entry.content %} <span class="xt_description">{{ entry.content|raw }}</span> {% endif %} </span> </div> {%endif%} </div> {% endblock %}

You can add the extra blog function for the random post above your normal one so it shows a random post and then the full list the second blog is shown with __xtblog_block_id=2 (now you know what that variable is for)
Here is a demo of the principle
http://blogtwig.xtgem.com/blag