not able to send text message on mac
How to set up Mac to send and receive text messages
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See the articles Set up Messages on Mac - Apple Support
Set up iPhone to get SMS messages on Mac - Apple Support
You can set up your iPhone so that you can receive and send SMS messages (short text messages) and MMS messages (text messages with graphics, audio, video, and other media) on your Mac. After you set up your iPhone, when you receive an SMS message, it appears on both your iPhone and your Mac. When you send a message to someone who uses a phone other than an iPhone, your message is sent as an SMS message.
Access your messages on all your Apple devices - Apple Support
Read Forward SMS/MMS text messages from your iPhone to your Mac or iPad - Apple Support