Hi @rachelp. Thanks for being part of GoDaddy Community! It's not clear whether you're choosing the domain and it's not changing or if you're not seeing the option. For the first, I'd recommend contacting our customer care team so they can make sure there's nothing stuck on our end. If it's the second, you'll need to make sure that the domain and Website Builder are both in the same account. Also, make sure the domain isn't already set up on another website or hosting product. Our care team can also help in this situation if you're not sure what's going on. Hope that helps.
JesseW - GoDaddy | Community Manager | 24/7 support available at x.co/247support | Remember to choose a solution and give kudos.