Transferring the domain to a trial webpage

Site URL: https://quillfish-rose-cfxe.squarespace.com/

Hi there I'm new to squarespace and I've paid for an annual subscription, transferring a domain name (still in progress) and wondering how to apply that domain name to my trial website pages? I can see 2 things here now, but does that mean I have to rebuild it into the domain? Sorry newbie here.