Python, Cipher signing (READ DETAILS INSIDE!)

Looking for someone who knows cipher signing very well. I will attach four (4) photos to this project. Information: The first photo you see is a "GET" request, this clearly just gets the data for that part of the program. The second photo is a "POST" request, this posts the data (this is where it's supposed to SIGN the post to the server) The third photo is how one of the signs will look when it's successful, I cannot replicate this due to limited knowledge..