As you may know, PHP Nuke stores it's password as md5 encrypted which means that you cannot easily recover the password without some brute force hacking. If however you are the owner of the website then that is not needed :)

The easy solution is to use phpMyAdmin or other database management software to change the password to "demo" then login and change it to your new password.

First visit phpMyAdmin then click on nuke_authors table. This will list your admins(change nuke_) to your prefix if different.

Click the pencil icon to edit the admin record.

Enter the following into the pwd and click GO

fe01ce2a7fbac8fafaed7c982a04e229

Your new admin password will be demo

That's it! Consider making a small donation if you find this tutorial useful.