If you're ready to start sending your first email campaign you'll need to sign up and connect your Instagram account.
You can skip the step of adding your subscribers right away but when you're ready to start sending email campaigns, you'll need to add subscribers so they have somewhere to go!
To edit a campaign it needs to be marked as Ready (as opposed to upcoming or sent).
A campaign that is Ready is a campaign that will be sent in the next 48 hours, so go and edit the send time and date of your campaign to sometime in the next 48 hours.
So connect Instagram, ensure your campaign is Ready (send time in the next 48 hours) and go and play around.
You can choose if you want your email campaigns to be approved before sending. If you go to your Email Settings, look at the top right and you'll see if this is turned on or not. If it's turned on you'll need to approve your email campaign before it sends. If it's turned off then it will send automatically as scheduled.