Step 1:

In your Mailjet account, open the "API keys" page. We'll reuse the details at step 5.

Step 2:

Log in to your Wisepops account.

Step 3:

Open your popup in the editor and click on the email form:

Step 4:

In the left panel, click on the "Mailjet" icon

Step 5:

In the popup window that opens, enter your API credentials and click "Submit"

Step 6:

Select your destination list

Step 7:

If you've added extra fields, make sure to merge them:

And voila, you're done.