Add a subject line. Something like Quarterly News from School Webmasters.
Subscription type can be Employees
Click on the Send or Schedule tab
Sent to: School Webmasters Employees
Sending options: If you are ready, you can send it now, or you can schedule it to go out later.
In the top right, you can send a test email so you can view it before you send it out. Once you are ready, hit Review and Send. If you are not quite ready, you can save your work in the top left and then exit.