Trouble linking existing site to new domain

My externally hosted domain expired and was taken, and so I purchased a new one and have linked it to my existing squarespace site. The home page shows, but all other pages direct to the old URL, which I no longer own. 

For example, when I try to navigate to ' STARTERS' from my home page, I am taken to

http://ww38.sourdoughbaker.com.au/blog/2018/1/17/starting-the-starter

How can I make the whole site work again? Do I have to go through and individually rename every page manually?

Can you share link to homepage?

https://sourdoughbaker.au/