Here are the steps that you will need to follow in order to give someone the Admin permission:

  1. Go to Initiative Settings
  2. Select the "Members" section from the left navigation menu
  3. Click on the person's name
  4. Click the "Edit" button (top right) 
  5. Check the "Admin" box

Please note: Only organization owner/managers as well as initiative Admins can assign the "Admin" permission