How to write input to Nrf Terminal

Hello, I'm following BLE fundamentals course from Nordic Academy. İn Lesson 4 Exercise 3, with using Nordic UART service. We sent and receive data. However i'm having problem sending data to my phone from my board. İt says
"In nRF Terminal, type a message to send to the remote device (for example Hello from PC!) and hit enter (to send an end-of-line and carriage return)."
But i cant write input to my nRF Terminal. How can i do that?

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