How can I get my Secret to activate my App

Hello everyone one favor somebody now how can i get my secret to activate and get access through the app?

I am using self hosting.

Thank you in advance

The secret field is optional, you only need to provide it if it’s set in the .env file

Got it, where Can I find the file *.env? and what line I should to add?

Ty in advanced for your help

You don’t need to set the secret field, you can optionally add it for additional security.

The file is in the root folder of the project