Code with error generates a blank site

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Hello, sorry for my English, I need help, I entered a code with some error and it leaves the site blank, I uninstalled it so I could start from scratch and I reinstalled it but exactly the same thing happens, the entire site is blank. How can I delete everything and reinstall it from scratch, only with the example codes that you provide?

Greetings, thank you very much

The page I need help with: [log in to see the link]

 

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