StoryTagger needs to know you have access to the email address with which you've set up your account.

I've received an invitation email
If you've received an invitation from StoryTagger you do not need to verify your email address.

I've received a Campaign ID
If you've not received an invitation email to StoryTagger you will need to activate your account.
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Once you've registered, look out for an activation email from StoryTagger. Tap the link in it to automatically activate your StoryTagger account.

You don't need to verify your email again.