I need help with connecting my sub domain

Getting this after connecting my domain

Have you added shop.arcafeed.com as a custom domain to your site?

Also note, the following DNS records are currently configured.

% dig shop.arcafeed.com
shop.arcafeed.com.	172800	IN	CNAME	sites.teespring.com.
sites.teespring.com.	300	IN	CNAME	teespring.netlifyglobalcdn.com.
teespring.netlifyglobalcdn.com.	20 IN	A
teespring.netlifyglobalcdn.com.	20 IN	A

These records aren’t quite correct. The shop.arcafeed.com should have the value of your Netlify site e.g. awesomesite.netlify.app as outlined in