I've turned Auto-Integrate OFF now.

I wanted all blogs to show in a forum thread with the username of who posted the blog but doesn't look like this is going to work.

I can still get the thread to start but it will be with the specified username in vBridge Settings.

And I guess users will need to register again if they want to use the blog, thanks anyway.

Do you have any special cookie settings in the Vbulletin options?

After the installation, I don't access to the Wp admin section. :-(

Sounds like you didn't map the users properly or you are not logged into Vbulletin. Please read the readme carefully.

Map VB usergroup: Administrators to:
Administrator | User role
and i click on Map User, after i set vbridge option on yes, after I don't access to the Wp admin section

Is your VB username the same as the WP username?

Yes, the same username and password.

Then that is why. It clearly states it in the first thread you cannot do that.

Now i've create a different nick for WordPress Admin but when i go to :
www.xxxxxxxx.net/blog/wp-admin
The browser redirect me to the forum login.

Create a new user in VB with a totally different name, set to admin. Login to VB as that user, then go to WP.