Change my native accent for second redo

I just failed my first attempt for 2 plosives, which is understandable, and I'm sure I could get them fixed for a redo. However, it looks like I made a mistake signing up, I chose my native accent as English, and it said I could pick a second, so I chose British English, because I misunderstood, and assumed it meant just your strongest accents, and that both British and North American would be listed, but it looks like that was just to specify my type of English as only British English.. My true native accent is North American, can I get that changed before my second time? If not, I'll just try again, I am very confident in my British accent, but again, it's not my true accent. Any help would be appreciated!