AFAIR the setting in the module should do it. Looks like it's trying to point to Admin page?? Make sure you've selected the correct page and clear your cache by restarting app pool.
You do understand that this product is no longer supoprted? You should be using this project https://nbrightbuy.codeplex.com/
You do understand that this product is no longer supoprted? You should be using this project https://nbrightbuy.codeplex.com/