Can't send or receive SMS text messages on MacBook Pro?

You can send and receive SMS messages on your MBP if you have it connected to your iPhone. See this article for instructions:

Use Continuity to connect your Mac, iPhone, iPad, iPod touch, and Apple Watch - Apple Support

I didn't think you could send SMS on a computer anyway because it isn't cellular capable.

About iMessage and SMS/MMS - Apple Support

Add or remove your phone number in Messages or FaceTime - Apple Support

Hi

what app would you be using to send SMS ? to a phone number.