Contact your Splio's account manager and ask:
What's your universe?
What's your API key?
What's your API domain? (should be Europe or Asia)
Log in to your Wisepops account.
Open your popup in the editor and click on the email form:
In the left panel, click on the "Splio" icon.
Enter the details shared by your account manager in the window that pops up and click on "Submit".
Select a destination list.