1. Add Engage to mobile navigation. See Customize the Salesforce App NavigationMenu.
2. Add the Marketing Action Summary Lead Visualforce page to the Mobile Cards section of the lead and contact page layouts for your Engage users. See Edit Page Layouts for StandardObjects.
3. Add the Marketing Action Summary Person Account Visualforce page to the Mobile Cards section of the account page layout for your Engage users. See Edit Page Layouts for StandardObjects.