Wrong Server List US/EU

I just bough Honorbuddy to use in my US WoW account, however every time I run the game using the Honorbuddy launcher, it launches in my inactive EU account, meaning it displays EU servers where I have no active character or game subscription.
How can I do so that Honorbuddy launches the game with my US account where my characters are?
This seems like a tinny problem, but still if I cannot solve it, I will not be able to use my HB key and I would have to request a refund.
Hoping you can help me with this issue
Note: When the game is launched, it does not allow me to choose an account, the only one dipleyed in the list is the EU one

 

start wow manually and attach hb after login into a character - i dont see your problem here tbh

 

I tried, but hb constantly tells me that I need to run WoW with the hb launcher
If there is another way I would gladly appreciate an explanation on how to do it.
Thanks

 

Is this a RAF Account?

 

Thanks, this was very helpful, also I found that I cannot have WoW running in full-screen mode.
Problem solved