MPSK SNR Estimator

Hello everyone,

I'm using the block MPSK SNR Estimator to calculate the SNR of a received signal. Yet, I don't know how to get its value (the output is a complex signal). I searched in the previous discussions and the response was "You can get the SNR by using the snr() function
to return the current estimate" but I don't know where I should use the snr() function? is it the python code? or a specific block?

Thank you!