Adding "www" CNAME record

Hey, I'm new here and need a little bit of help. 

I bought a domain from "Squarespace." (nirsrour.com).
I set up a bucket in Google Cloud with the exact domain name (nirsrour.com).

Everything works great when I type in the address bar: nirsrour.com, or https://nirsrour.com.
but, 
I'm having trouble with the "www" subdomain.
How do I link "www.nirsrour.com" or "https://www.nirsrour.com" to nirsrour.com?

I followed the instructions of Google, but
I don't understand which CNAME record I should add to my DNS settings:

1. 

2. 

• What should I type in? number 1 or 2?

• And why i dont have SSL certificate from www.nirsrour.com ?
• Do i get SSL certification for sub-domains like "www" ?
• How much time does SSL certificate takes to be approved ? cause it still written"Processing". 

Please Help.