How do you enable MMS messaging to send a message?

Etchsquad wrote:

This response does not work. Why can MMS text not be sent from the MACBOOK but can be from the phone and when did this change? WHY did this change? Mac was always more user friendly than others, why change now?

And under need more help, contact Apple support response didn't work?

mer2175 wrote:

I suddenly can't send texts from my iMac. I get a message MMS Messaging needs to be enabled to send this message. What do I do?

Forward SMS/MMS text messages from your iPhone to your Mac or iPad - Apple Support

This response does not work. Why can MMS text not be sent from the MACBOOK but can be from the phone and when did this change? WHY did this change? Mac was always more user friendly than others, why change now?

Suddenly There is only one text message i cant receive or respond too