MATLAB neural network code

[rsdone]

Using the GUI in MATLAB R2018b, I developed a time series neural network (NARX) and generated a function (weights, parameters, etc.) based on the model results. The next step is to test the model performance on new data but that step can only be done from the command line. I checked the MATLAB help forum and someone asked the same question at https://www.mathworks.com/matlabcentral/answers/309156-how-can-i-use-neural-network-function-generated-by-matlab-i-use-r2015a?s_tid=answers_rc1-3_p3_MLT but my MATLAB coding background is too limited to make use of the reply. Can someone help me with the code needed to apply my model to new data?