Activating New Domains for One-Click Wordpress

So I run the following command and given a list of domains that I would like to activate HTTPS for. However, the domain I would like to activate HTTPS is example.com, instead of blog.example.com. How can I do that? Or will it be the same for both domain and sub-domain to get activated?

~# certbot --apache Saving debug log to /var/log/letsencrypt/letsencrypt.log Plugins selected: Authenticator apache, Installer apache

Which names would you like to activate HTTPS for?

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1: blog.example.com 2: www.blog.example.com

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Select the appropriate numbers separated by commas and/or spaces, or leave input blank to select all options shown (Enter ‘c’ to cancel):

I have checked out this: https://wordpress.org/support/article/changing-the-site-url/ but the instruction does not seem to be straightforward enough for my issue.

Thanks.