Telling someone to have a good weekend after you have told them how to fix there issue is not sarcastic. I noted you forgot to enter your cookie prefix on step 4 of install
I dont see where I need to redirect you anywhere. I responded to what your issue is. You need to rerun your install and on step 4 as I noted enter your cookie prefix of bb. This is what you forgot when you installed. In your vbulletin admin please ensure your cookie settings in there program are as I posted.
To have the login read correctly in our application the vbulletin license number must be correctly entered in the config on first step of install and on step4 we ask for that cookie prefix. The vbulletin password cookie is a mix of the password cookie prefix and vblicense number if either of these are incorrectly entered on install script you will not get into admin.