If I use a nominee director, how can I control and operate the bank account?

Even if the IBC involves nominee directors, You can certainly have the signature right in the offshore bank account. That would allow You to directly control the transactions. At the same time, a more secure arrangement (from the fiscal correctness point of view) is one where the professional third-party manager effects control over the bank account. In this case, the relationship between the beneficial owner and the nominee director is regulated by the standard Terms & Conditions of business and, if necessary, by a more specific client-manager contract. Such contract could determine, in particular, the procedure of passing any instructions and information from the client to the manager in the most secure and confidential way.