Interpreted matlab function in real time simulink

I'm reading two channels from analog input in the simulink, signal type sample based, then i want to run code on the input signal using "Interpreted matlab function" defined function, the code i written to have two input signals and there will be one output.

so how can I change the of input channel to the same name of Interpreted MATLAB Function input name? since when i tried to run the simulink with input signal from work space its running!