I am being asked to change the credentials for my node red but i dont know how to access it and change it

Also when i am trying to hit a url or anything over node red it is not working and i am getting the following error in command

Hi and Welcome,

It's an auto-generated message because you don't explicitly set an encryption key.

It's not mandatory.

Okay thank you

Where does it come from?

From a function node maybe i was trying to figure that out it could be a function node or a json converting node