Your current Dungeon Master Introduction post URL looks like this:
http://wordweaving.co.uk/?p=13
... which is awful for usability, findability and SEO purposes.
Most websites now use more friendly URLs that give a sensible URL for every page/post, usually based on the date/title of the post in question. If you also did that and switched to the pretty version URLs, your Dungeon Master post would instead be something like:
http://wordweaving.co.uk/2013/dungeon-m ... roduction/
See? That's much better, and has lots of benefits:
* the URL fully describes the resource - if I see that URL posted on another website without any context, I can instantly work out what the content of the post will be
* the URL now contains keywords which help Google and other search engines index your post
* the URL is editable and creates "find-ability" to other parts of your site. I could read the new URL and guess that if I deleted the /dungeon-master-an-introduction/ part, the URL would now end in 2013 and thus should show me all the posts from 2013. And lo and behold, if I try it, that's exactly what I'd see 'cos that's how WordPress works

Find-ability through editing URLs in your browser is a useful way of navigating the web - you've probably done it yourself even without realising.
Whereas if all your posts are simply /?p=13 then all the above benefits are lost.
Please setup these Pretty Permalinks now, and do it before you write any more posts: it's the best option for your site long-term. You can ignore most of the tech speak in the article I linked to, and jump straight to this bit:
http://codex.wordpress.org/Using_Permal ... _structure
I suggest either going with the "Postname" option, which will give you something like this:
http://wordweaving.co.uk/dungeon-master ... roduction/
...or I suggest putting the year in there too (it helps with organisation). Select "Custom Structure" and enter
/%year%/%postname%/
You'll get URLs like this:
http://wordweaving.co.uk/2013/dungeon-m ... roduction/