If you have added and configured the offer banners from the Magento admin side (Manage Offers) and selected the Offers from the “Bottom Navigation Modules” (Store-level), the users can access the Offers tab from the mobile app. (Left image)
When the users press on the “Offers” tab, they will be redirected to the offers page and see the different offers. (Right image) By pressing on any offer banner, the users will be redirected to the specific page as per the configured redirection option from the Magento backend (Manage Offers).