How to reinstall Terraria on Steam

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I recently added unsupported files to my Terraria and edited my files. This was a error on my part because now Terraria won't load.
I have no way to fix this and am not good enough at file programming to fix it with any hardcore methods.
My biggest problem is that I don't know how to delete and reinstall the game. I looked it up and it told me that there was a way to delete it in the launcher, but gave no clear way how to get there. I may have looked this up incorrectly or been looking untrustworthy websites.
How can I re-install Terraria?
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Quick Answer about "How to reinstall Terraria on Steam"
Can you reinstall a game on Steam?
Step 1: If you want to reinstall the game at a later date, enter Steam, select the game from your library, and double-click the game name. Step 2: You can also right-click the game name, then select Install. Step 3: Follow the on-screen instructions.What happens if you Uninstall Terraria?
The more recent 1.3. x versions (developed by DR) store save data in the /Documents folder. Older versions (developed by CodeGlue) store the save data together with the game's own data, so that will disappear if you uninstall.How do you completely reset Terraria?
Terraria | How to reset / restart / delete my world PrintNavigate to your Game panel. Select the "Backup World" function. Wait for it to finish successfully, it will tell you "The backup has completed successfully" then close that window.What happens if I Uninstall a game on Steam?
Uninstalling Steam will remove all the games you've installed through the software, along with their saved data and other downloadable content. Moreover, uninstalling the games will also delete your saves.How To Reset Games On Steam - Erase Game Data
Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
Images: Shourav Sheikh, Tom Wilton, Kamil, Nancy Yu