When generating your subscribe form under Support>Code Support>Subscribe Contact Form, you have the option to choose field groups to go along with the form. Choosing Source as a field group generates a checkbox that can be used to determine the subscription point by which your contact subscribed. However, you may not want to leave it up to the contact to select the checkbox.
For Example: In the below image, we have a checkbox for the footer subscription point.
To hide the checkbox and also make it default to being checked:
1. Locate the code snippet for the checkbox. In this case, it is for the footer of the website.
2. To hide the checkbox from the end user, remove the highlighted code in the image below.
3. To ensure that the checkbox is always selected by default, change the value in value= from "off" to "on."
4. Your code should now look similar to what you see below.