I am unable to see text in the mobile app.
You need to turn off Dark Mode on your iPhone or iPad. Switch to the Light Mode setting. See these instructions:
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. We hope to have it available by the end of August 2020. Until then please use the MasterCook app with Light Mode on your device.