Need help regarding pop-up optin page

Hello guys.I have been stuck on this for about 8 hours.I was using pippity and mail chimp to try and create a pop-up which does not redirects to another page and instead just close after collecting information.However, i have had no success so far, even tried different plugin.Anyone can tell me how can i create a pop-up optin form which does not redirect to thanks page and instead allow the visitor to continue with page he intended to view.I will be really grateful.