In order to skip a send in the future, simply go to the Calendar page on your Schedule and select the day you want to skip. This is commonly used for holidays or just days that you don't want to send a newsletter on.
If your newsletter has not yet generated (the countdown banner at the top of your dashboard will alert you to this), you can switch your schedule from Active to Paused. This will suspend the newsletter until you are ready for it to begin sending again.
Unfortunately if your newsletter has generated, there is no way for us to cancel it. Pay close attention to your reminder emails and the generation deadline time. This will be 1 hour prior to your delivery time. We need this window of time to create your amazing newsletter since we are creating a personalized, individual email for each of your subscribers.