Um, I think I had a really similar problem - but with the site login.
Try sending a reset password request t your email and htne just input the same password.
That's the thing - the Admin CP doesn't give you the option to send an email, or at least mine doesn't It just tells me to try logging in again. I completely deleted the scripts and am reuploading with a different username; I hope that works c:
NVM, I found out how to send the email, but unless it takes a while to process, I am not receiving them >.<
Well do you have the same username and password for your adoptables site and forum account? If you installed the forum with admin account under a different password, it will not work.