I have code to embed for two different instances. One is code that is to go at the bottom of every page. This stays the same. The second is code to add a pop-up when someone comes to the site. Both sets of code are name and email capture to sign up for our newsletter. The pop-up we want to change throughout the year. We currently have a pop-up and an email capture at the bottom of all our pages, but they were implemented before I took on the role. The information is filtered to MailChimp. We now want the customer information to filter to our CRM System. The CRM System gave us code to create the pop-up & bottom of page email, but I don't know how to take down the old ones and replaces them with the new codes. Where in Shopify do I go in to change/add this code?