I just tried this and it seemed to work fine.
Main Menu -> Settings -> Profiles -> Export Profile -> USB ....
Before starting, I plugged an empty 32Gb USB stick I had into the glove box USB port, then when on the Profiles screen made sure the profile I wanted to export was ticked (you'll need to have saved a profile first). When I hit OK on the screen giving me a choice of exporting to BMW Online or USB stick I just selected USB and off it went. Took about 10 seconds then said ...
What do you see when you pick the Profiles option off the Settings menu? Do you not get something like this?
PS - If you want to export your profile to BMW Online, you'll need the ID & password you registered with first time you do it.