VS Miles Booster on Delta Domestic

Hi Folks, Quick question for you.
I’ll be in NY in November and whilst there will be going up to Boston to visit family. I called the Flying Club to see if I could book the domestic flight via them but they referred me to Deltas website to book.
Fair enough, I’ve now done that and added my Flying Club number to the booking but I forgot to ask if it was possible to use the current Miles Booster promotion to boost the miles.
It won’t be many miles but I can’t see any way to add the flight to my account on the Virgin App or the website. I can add it to my Delta App but just wondering if anyone knows of a way to add it to my VA account as I don’t have a Skymiles account.
Many Thanks
I’ll be in NY in November and whilst there will be going up to Boston to visit family. I called the Flying Club to see if I could book the domestic flight via them but they referred me to Deltas website to book.
Fair enough, I’ve now done that and added my Flying Club number to the booking but I forgot to ask if it was possible to use the current Miles Booster promotion to boost the miles.
It won’t be many miles but I can’t see any way to add the flight to my account on the Virgin App or the website. I can add it to my Delta App but just wondering if anyone knows of a way to add it to my VA account as I don’t have a Skymiles account.
Many Thanks