To Send an email, from the Emails tab find an email and select the Send button. 

Next, select the list or lists by clicking on the list(s) you want to send to. You will note that as you select a list it is highlighted as demonstrated in the illustration below. The list, "A BombBomb Contacts List," is highlighted.

You can directly type in email addresses, separated by semicolons. You can't directly type in email address AND send to a list(s) at the same time. If you directly type in email addresses, they will be sent to those addresses and not any selected list(s).

Select Send Now or Schedule to set a delivery time. The scheduler automatically defaults to one day ahead. If you want it to send later today then you must change the date to today.