Add a checkbox on registration page for subscription newsletter with Simplenews I'd like to add a checkbox for subscription to a newsletter on the user registration page.

I'm using Simplenews.

How could I do that?
After you have created a Newsletter category, go to admin/config/services/simplenews and click on edit newsletter category next to your newsletter category.

You'll see subscription settings. Select "Default On" or "Default Off" to display a checkbox on user registration form.

see image below for detailed explanation of setting mentioned above