1. Take a backup of the web.config file for your site
2. Open the web.config file, and search for 'urlformat'. You should find this in the section, like this:

<add name="DNNFriendlyUrl" type="DotNetNuke.Services.Url.FriendlyUrl.DNNFriendlyUrlProvider, DotNetNuke.HttpModules" includePageName="true" regexMatch="[^a-zA-Z0-9 _-]" urlFormat="humanfriendly" />

1. Change the urlFormat value to 'advanced', like this:
   

   <add name="DNNFriendlyUrl" type="DotNetNuke.Services.Url.FriendlyUrl.DNNFriendlyUrlProvider, DotNetNuke.HttpModules" includePageName="true" regexMatch="[^a-zA-Z0-9 _-]" urlFormat="advanced" />

2. Save the web.config file.
3. Request the home page of the new site - the site is now using the Advanced Url Format.
4. Fully test the site to ensure it is operating as expected. If any issues are found, restore the web.config backup.