Charge Anytime - how can I switch cars, or connect Charge Anytime to multiple vendor accounts?

After a small number of charges with the Charge Anytime bolt-on I can see a credit on my OVO account so it seems to be working albeit with a few small issues.

The sign up process asked if I had one or more EVs so it would follow that the ability to add more should be available or if a manufacturer account which is connected to the Charge Anytime account has multiple cars within it there should be some mechanism to either manually select which vehicle is waiting to be charged or perhaps Charge Anytime should detect which is ready to charge automatically.

I need to charge a second car which is in my "My Renault" account but am still waiting for a reply regarding my situation and what I should expect to do to make this work.

Does anyone know how one can switch from one car to another or to connect Charge Anytine to multiple vendor accounts? (For example Renault and Vauxhall or two Renault accounts).

Any help much appreciated so I can charge at the reduced rare.

Thanks 

Gaz