I am unable to see text in the mobile app.
You need to turn off Dark Mode on your device. Switch to the Light Mode setting. See these instructions:
Android devices: https://www.lifewire.com/what-is-android-dark-mode-4178630
There are many apps that don't work with the new Dark Mode yet. MasterCook is one of them. Currently, the MasterCook mobile app developers are busy creating a brand new offline feature so that users can view their cookbooks and recipes in offline mode when they don't have internet access. This feature has been requested by numerous customers. Once this feature is complete, then we will consider adding dark mode support which would require us to recreate all screens with different program colors.