Your question is a little vague when you say use, however I will try my best to help you. 
Tachiyomi is a Free, Open-Source Software (FOSS) that allows users to read content such as Manga, and automatically track their progress and check for updates. 
To install it, you will need an Android device that can run apk application files. You can download it here: https://tachiyomi.org/
Once installed, you can add extensions for sources of content, search content, set up trackers, and more! 
Does this answer your question? Is there anything in particular you are having trouble with?
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