I have the same issue,
but now I cannot sigh in with the ADMIN, so I'm not sure where do I have to go to change the cookies (that I set wrong)
Witch file do I edit with the right cookies info?
If this is a new install I would think rerunning install and answering the questions should solve this
Not being able to login with a valid login is either going to come down to you on install entering the wrong database info for your forum database in the config or usually entering the wrong integration type on step 4