Can't add trusted sites to security zone in internet options

When I try to add sites to the trusted sites in Internet Options, a
message is displayed that "sites added to this zone must use the https://
prefix." But adding the prefix produces the same result. Is there a
way to correct this.

Thanks...

Never mind. I just realized that I hadn't been adding the "s" to the
http. It works now that I have actually followed the instruction.