Backend related problem

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please tell me what to do and what is happening in laymen terms because i didn’t even understand solution of this challenge,

i focused on this " Then, in the /json GET route handler you created in the last challenge, transform the response object’s message to uppercase if process.env.MESSAGE_STYLE equals uppercase. The response object should either be {"message": "Hello json"} or {"message": "HELLO JSON"}, depending on the MESSAGE_STYLE value.

Note: If you are using Replit, you cannot create a .env file. Instead, use the built-in SECRETS tab to add the variable."

please tell me
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solution: boilerplate-express-3 - Replit

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Challenge: Use the .env File

Link to the challenge: