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You need to be inside a comic in order to see the alt-text. Make sure you have selected a comic and you are seeing it full-screen. Then just tap with one finger to reveal the alt-text card. Tap again to return to the comic.
Open the "Settings" app from your home screen and select "xkcd". You will find options to disable notifications for "New Comics", the "Daily Random Comic" and other "Announcements" individually. The changes will take effect the next time you open the app.
This comic is created by Randall Munroe and it is licensed under a Creative Commons Attribution-NonCommercial 2.5 License. For more information visit xkcd.com
This app is developed by Leonardo Cantelmo. For more information visit telmux.com