To be removed from all classes that you're signed up for, you reply ' stop ' to any Remind phone number.To be removed from only one class, you reply "unsubscribe @code" to the Remind phone number. So if, for example, the code for the class you no longer wanted to be in was "math" you would text: unsubscribe @math.  You can also retrieve these instructions by texting ' help ' to any Remind message at anytime.