I'm using the vBulletin Version 3.6.7 / I'm using the Request Username Version 3.6.8

They should be fine. Did you upload the .xml product file?

Yeah I did, but It's still not working, Lol.

maybe you need to reinstall it again. it should look like this...

Try uninstalling and reinstalling from a fresh copy (meaning download it again). If that doesn't work I would require some investigation.

Still doesn't work, ='(!

Can anyone confirm this working in vBulletin 3.7.0 Beta?

There's a bug (or something working wrong with my live and dev sites):

You're inserting the requested nick to the database in an escaped form, but once the admin approves the nick, it's given escaped to the datamanager. For example:

<julian> gets inserted as &lt;julian&gt; to the database. That's ok.

But once the admin approves the change, you're passing the escaped string without unescaping it. So vbulletin thinks that the username to change is &lt;julian&gt; and will produce an error.

I have the exact same problem as Bruce Lee..... Hack installed correctly, I just can't activate in the Usergroup Manager.

That is a very weird bug indeed. As soon as my programming workspace is back to normal I will check this one out.

TCE, you have the bitfield .xml uploaded to /forum_root/includes/xml/? That may be your problem as well as Bruce's.