Homesteadcloud domain showing... not the one I have purchased. How do I get my real domain and site to work?

I have just spend months creating a new website for my business... and purchased a domain name to go with it. When I go in to edit I choose the domain which shows as www.nibblesandsipstours.com but when I published it still showed it was publishing as www.nibblesandsipstours.homesteadcloud.com and when I search online I just get an error message for my actual domain. My deadline to have this up and going is tomorrow... how can I fix this? I also want to point my old domain to this new one and don't want to have any issues with that!