Ok, you may accidently used some special words here and leads to mis-understanding.
Subscription in Thingworx is a script that can be triggered by events, such as alerts, and you may refer to "order a class in the gym", right?
For your use case, the de-activate is to stop future clients' ability to register or add their names to a table in this gym, so your toggle button is used to disable the Insert function. If there's a Login or Submit button here, using to upload register information, then you can use toggle to disable these button widgets, and the widget will turn grey and become not clickable.