This plugin allows you to select a main category for your posts for better permalinks and SEO. The chosen category is shown in bold on the ‘Posts List’ page and the ‘Post Edit’ page. You can select a different permalink category on the ‘Post Edit’ page using the ‘Categories’ box (hover over the categories and click on ‘Permalink’ to select one, then save your post).
The Pro version adds the features requested by the users. The main feature of the Pro version is the support of post type (brought by plugins such as gallery plugins or others like WooCommerce) and their taxonomies (products and their categories for example). You can get a serial for the Pro version on the left, then just enter the serial you will receive by email in the plugin’s settings (Pro tab).
The permalink structure needs to be set-up in your WordPress through Settings > Permalink. There you can pick a structure but the best is to make your own custom structure, such as “/%category%/%postname%/“. Here are a few variables you can use:
For all the explanation and important technical stuff to know about permalinks in WordPress, the best is to have a look at this page: Using Permalinks on WordPress.org.