How does Apple 7 set the SMS laser?

How to set the iPhone7 SMS after reading it? If you don't know whether the other party has received or seen the short message, you can turn on the function of sending the read receipt by short message on iPhone7. If the setting location is not found, you can see the following.

How to set up SMS sending and reading for iPhone7?

1, first we open the settings, and then look for information.

2. After opening, we can open the ellipse on the right of the column that sends the read receipt.