When you are ready to send a Campaign, you will be taken to a separate page where you can schedule the Campaign, as well as select what Lists to send to.

From this page, you can send a test of the Campaign to a specific email address (such as your own), so you can view the Campaign the way your subscribers will see it. After that, you use the multi-select box under “Select Lists” to set which Lists you would like to send the Campaign to. From there, you have the option to either send the Campaign immediately by clicking “Send Campaign Now”, or you can use the datepicker field to set a date/time in the future, and then schedule the Campaign to send at that date/time by clicking “Schedule Campaign Now”.