To change the start date of your campaign, follow these steps;
Step 1: Click on your"Campaigns" in the upper left-side of your account:
Step 2: Choose the specific campaign you want to change the start date for:
Step 3: Click "Add Leads":
Step 4: Select the leads you want and then choose "Add to Campaign" importing into the campaign:
Step 5: Click on "Start date":
Step 6: Select the new start date of the campaign (you can choose days, weeks, or months):
Step 7: Once the date has been selected, click the "Add # leads" blue button below and finish setting up your campaign: