I created a subscription form at mailjet and embedded it on my website where I will collect basic subscription info: email, firstname, lastname. After submitting the form, a very large check mark appears, indicating that the user is finished. But below, a rather invisible message is displayed about checking the user's inbox for the confirmation email. I found the obfuscated place where the text of the message could be changed, but could not prevent the big checkmark from being displayed. Nor could I add color or emphasis to the message text to let the user know they had a further step to do to complete the opt-in signup. How it works now, I think many users may miss the fact that they have to look out for the confirmation email to complete their sign-up.