HelloI'm new to shopify, when someone visits my store I would like a pop up box that asks them to sign up to our newsletter? I'm not sure how I do this, if its an app I need to install can it please be recommended? 

HelloI've just launched my online store and i have paypal express at the checkout, that happened automatically. all the emails are the same but anyone that has paid with paypal express so far their payments are pending and its been days and i've prom...