I just downloaded and installed Octiprint on a Raspberry Pi 3 B. The web server is work great and connects to my printer fine. However when I installed the drivers and software for my 3.5 inch TFT screen now it ask me on that screen for a user name and password log in. When I put my info in there I get a message on the little screen saying my log in or password was incorrect…. Is that not the same user name and password for the web server end?
It is not. Try the pi/raspberry username/password that is common to most Raspbian distributions.
Note that without further configuration, you will not get a UI on the display.