Texting non Apple users from my iMac
I'm trying to send texts from my iMac using Messages to people who don't use an iPhone. I've tried to follow the directions from Apple about forwarding texts but I don't see all the things they mention.. When I type in a phone number in Messages for someone who doesn't have an iPhone, I get a pop up that says it can't be sent because the number is not registered with Messages. I have iOS 16.4.1 on my iPhone 11 and MacOS Catalina 10.15.7 on my iMac.
Thanks in advance for any help.
[Re-Titled by Moderator]
iMac 21.5″, macOS 10.15