Step 1: 

Tap the Archive button in the top-left corner of the screen.

Archive button is located on the top-right corner for Android phones.

Step 2

Find and tap the Story you’ve posted for the campaign.

Step 3: 

Take a screen shot of the Story. The “seen by” number count must be visible.

Step 4: 

Send the screenshot to us by email (include your Instagram ID in the subject line).