how do I change the type of bank account from credit card to business account?

In setting up a new bank for our savings, I've realised that our main business account is set up as 'credit card account' which it isn't, it's just a normal business working account, how do I update this account type so it's correct please? I've been through all the edit pages and no where can I change the type of account. Thanks for your help in advance.