Connecting custom domain through Cpanel showing errors

Hi people, I’ve followed Glide’s tutorial for setting up a custom domain by adding some details to the DNS records. However, on Cpanel, the ‘@’ character glide tells you to paste into your records brings up the following error:

“The DNS label must contain only the following characters: a-z, A-Z, 0-9, -, and _.”

Has anyone been through this?