I am sorry for any frustration! It looks like you are working with our custom code editor. The process is a little different from our standard editor. When you're on the custom code dashboard page you will see "Finish" in the top right corner.
A new screen will load where you will see the option to "Select Lists." After the list or lists are selected you will see the option to schedule your email on the right side where it says "Delivery Date."
In case you were looking for steps for scheduling a standard email campaign, click here for more info.