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.
We will be creating a new Dark Mode App for MasterCook after we complete and release the new offline feature. The plan is to have the offline feature available by the end of 2020, so we will begin working on the dark mode feature in 2021.