Beginner help with Raspberry pi

I have followed the Instructions and have Blynk installed on my android phone. I have inserted the token when starting blynk from the rpi terminal.

I have connected a temperature sensor to the 3.3V-GND-PIN2 on the raspberry pi.

But how do I make it show the values in the app? I have tried adding a “value display” and selected virtual pin 2 and have pressed the triangle. But nothing shows. What am I doing wrong?