I already have a registered domain name

Hi

I emailed Squarespace about 5 days ago but have not received a reply and my trial time is running out whilst I'm waiting for their response. I can't find where it addresses if you already have a domain and attached email address. I've had these for years with a previous website which I recently deleted. Can someone tell me how I proceed with choosing the package I want? They all show that I must buy domain and/or email addresses.

Many thanks in advance.

Do you have a registered domain that you can see in your domains panel? What is the domain you are looking for? Let's try to recover it before selecting a billing plan for your website. 

https://domains.squarespace.com/ 

You may need to log in with your Squarespace account.