Quick Guide.
First unpack the folder into plugins, where all the files and sub folders should reside in [wb-vb] folder.
now in Wordpress Plugins, activate the plugin and then go to Settings --> WP Vb integration
Essentials are as follows: (everything else you can play with!)
1) Path to vBulletin. / means the Vbulletin Forum is in your root folder. ie
www.mysite.com/
/forum/ means the Vbulletin Forum is in a folder called forum. ie
www.mysite.com/forum/
ALWAYS add the trailing /
2) Activate login sync feature [check box]
3) Activate post sync feature [check box]
4) Forum ID - this is the NUMBER of your desired linked forum ( sub forums are added from this) so look at your vbulletin URL
http://mysite.com/forumdisplay.php?6-The-Forum the ID would be 6
5) vBulletin user id to assign posts to - this is numerical as well. so ID number of who you want to add these too.
6) vBulletin -> Wordpress Settings
Add vBulletin plugins ... click add
7) go back up and click [TEST] - if all is well you should see... vB loaded Plugins - 1|1|1|1|1|1|1
8) SAVE CHANGES...
Good to go!