When most people think of text messaging, they think of typing a message on a phone and sending it to another phone. But what if you want to send a text message from your computer? Whether you’re at work and want to text your spouse or you’re out and about and want to let a friend know you’ll be late, there are a few ways to do it.

The first way is to use an app. There are a number of apps that allow you to text from your computer, and most of them work the same way. You type …