QGroundControl & 433MHz Telemetry Issue

Hi everyone, I am a beginner and bought the QAV250 kit from holybro, and am currently trying to setup a connection between my computer and the drone using the 433MHz 500mW telemetry V3.
The problem is that when I connect the telemetry to the computer, the status remains disconnected.
I have tried what is mentioned from the link: Connection problems · QGroundControl User Guide.
And found out that there is nothing at my console output.
I can’t seem to find any other solutions on the internet, can anyone help me please?