Replacing my published Squarespace site with an edited duplicate Squarespace site

Site URL: https://indigimatha-pre-launch.squarespace.com

I'm a newbie to SquareSpace.  I have created a website. And paid for a year hosting. It's a simple pre-launch site. I then duplicated the site and edited the duplicate to a point that I am now satisfied with its layout and funcitionality  (for the time being). I would now like to replace the published pre-launch site with my edited duplicate website...

Appreciate any help in resolving these couple of issues.

1) Is this possible and how do I do it?

2) Once all changes are incorporated and duplicate site has replaced the published website using  the current name e.g. https://*temp* .squarespace.com 

3) I would then like to re-publish the site under my own domain name e.g. https://mywebsitedomain.com  Wondering what is the process to do this? Is it just amatter fo republishing but changing the domain name to one of my choice?

Thanks so much for your help.

Kevin

3 minutes ago, Newbie007 said:

I have created a website. And paid for a year hosting. It's a simple pre-launch site. I would now like to replace the published pre-launch site with my edited duplicate website

See Can I move my subscription to a different site?

Then why offer to "Duplicate Site" if you can't transfer? I did the same thing as newbie007. I'm surprised this doesn't happen more often. You should take the option to "Duplicate" off - that's ridiculous.