My website always throws a 502 error when I go to it

I have a .tk website, and it worked fine on freenom, but when I transferred to cloudflare, I started getting 502 errors. Here is the website that I am trying to set up with my domain: https://grumpy-seahorse-37.telebit.io/. Any help would be appreciated, since I’m brand new to cloudflare.

This is what I do see when I visit the above URL:

In terms of a 502 errors, may I suggest below article for more information:

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