It works exactly like the Joomla converter, it is also not a "click & ready" script, basic knowledge of PHP are needed in order to achieve the conversion. It is important that the WP-Forum is empty before you start to convert.

Short instructions:

1. Install WP-Forum in your WordPress system
2. Create categories and sub-forums
3. Download script, unpack and upload to the server
4. Adjust the accompanying config.php
5. Go through the settings in config.php step by step and set the preferences
6. On line 37 / 38 enter the source ID of the Fireboard forum and the ID of the WP-Forum
7. Execute the converter

After a successful conversion you should see something like this:

• Converting Category 5 to 3
• Processing 17 Threads
• Inserted 17 Threads
• Inserted 84 Posts

If it was successful, please repeat step 6 and 7 with all your forums.

Then you should be done!

You can download the script at the bottom of his German article.