Follow these steps to edit your membership template: 
  1. Go to Marketing and Communications > Membership Renewal Efforts
  2. Click the Templates Tab. 
  3. Click your Membership Renewal Template
  4. On the Membership Rules tab, move the email packages so that they appear before their mail package counterpart using the Move up or Move down buttons. (For example, when you finish editing, your rules may appear similar to this: Membership - 1 month before expiration (email), Membership - 1 month before expiration (mail), Membership - Month of expiration (email), Membership - Month of expiration (mail), etc.)
  5. Run your membership renewal processes again and you should see the option to Send email.