Graham bemethavinci You just set it to allow guest posting when you add the block
You have to add the categories and boards from the building tool

Non logged users will have to enter a captcha and there is some protection against them using other users names
plus If you want to use the standard forum without custom twig then download http://xtgem.com/css/xtforum.css to your site and rename it xtforum_template.css it then gets automatically linked to the forum page xt_forum is the main forum body class
and you can customize it as much as you like with your own colors etc

I have set a forum page and the CSS on w3loggerz just click on 'Panel-body' and 'Edit forum structure' on the forum page to set up your categories and boards