How to share a page's URL with my custom domain when my site isn't live yet

My site isn't live yet. I want to have all my links in place before I make it live. Right now I can't share the URL in my browser for any of my pages, because it shows the squarespace "Built in domain" instead of my custom domain. I've read the info in squarespace about signing out of my account, then grabbing the link while acting as a visitor to my site...but visitors to my site can't view anything yet because my site isn't live yet. I don't want to have it go live without links working. How do I link to certain pages on my site when I'm not live yet?

Use your custom domain for your links and set the site availability in settings for password protected. That way your links will be working but no one can view the site yet without the password. Once you enter the password, your browswer will remember it and you can test everything. Make sure you set your custom domain as the primary domain.