To create a thank you message (or display a coupon) after your visitors sign-up to your newsletter, follow these step:
On the widgets page, find the widget you want to change and click the pencil button to edit it:

Click on the "Step" button:

Clone "Step 1":

In "Step 2" add thank you message or display a coupon:

Select again "Step 1" and click on the "Ok" button:

Edit subscribe form:

Select "On submit action" — "Change step" — "Step 2" and click on press on "Ok":

Don't forget to save your changes.
On the widgets page, find the widget you want to change and click the pencil button to edit it:

Click on the "Step" button:

Clone "Step 1":

In "Step 2" add thank you message or display a coupon:

Select again "Step 1" and click on the "Ok" button:

Edit subscribe form:

Select "On submit action" — "Change step" — "Step 2" and click on press on "Ok":

Don't forget to save your changes.
Published on: 13 / 06 / 2019