Go to Marketing > Broadcasts

Click on Create Broadcast

Select "Text Message" option:

Fill out all details on Settings

Complete the Goal for the Broadcast (this is an optional step)

Enter in the message under Content - as you type in the content, you will see the character count change:

Once you're ready to send, you'll see the final review page with the recipients, price for the SMS and scheduling

Select "Pay now" and complete payment

After the payment is complete, then click "Send Broadcast" to complete it!