Go to Campaigns and set up your campaign. Once you reach step 3 Settings you have two options:
Schedule message Select the date and time you want the Campaign the be send out. We will prepare the Campaign and automatically send it out at the selected moment.
Send Now Alternatively you can select 'Send Now'. That will send out the Campaign directly, when you click send. You still have the option to spread the Campaign over time
Spread over time With this option you can spread the messages to be send out over a period of time. You can select the time block in which you want the full Campaign to be send out.