Whoa Bucko.
When moving a site the control panel is not functional until You complete the transfer.
You have two items to address.
First did you copy over the database to the new site.
If you did then you have a new database location/name also a new database user.
When you copy over the script files/php files you need to set permissions to all of those folder/files.
Then you need to edit the config.inc.php file with a text editor to set the paths and passwords for both the database and script files.
Then and only then will your cp work as well as your forum.
The CP is not a tool to use for moving a site to a new location nor will it work so.
You need to follow the transfer guide first. Then and only then can you access the cp.
