If you're not ready to publish a campaign, you can save a campaign in progress as a draft. On each step of campaign creation from the Ads Design step (2) onwards, you can save your campaign as a draft, so you can resume building it later without losing your work.
AdEspresso does not automatically save a draft of your campaigns. You must click Save As Draft at the top of the page during the campaign creation process.
To resume a draft
Find your saved draft campaigns in the campaign drop-down list, or click See all campaigns and then filter for Saved as draft in your campaigns list.