If you've saved a draft of your campaigns you can find them inside of the campaign drop down list:
Or on the ad account dashboard:
Or, you can go directly to the list of your drafts by clicking this link after logging in:
NOTE: AdEspresso does not automatically save a draft of your campaigns - you must select the Save Draft button at the top of the page starting on Step 2 of the campaign creation process. You can find those instructions here.