NEED A MATLAB EXPERT

I have trained a NARX network using the Neural Network Toolbox Time Series App using a set of data in column format with 1999*3, as the inputs set. The target set for the training was again in column format and contained 26 variable with 1999*26. I trained the network with the data in cell column format, with 9 hidden neurons, 2 delays using Levenberg-Marquardt as the training algorithm and with 70% Training, 15% Validation and 15% Testing. From this, I want to be able to input a set of unseen data in column format. The input data contain of 4 different inputs (TEST_000, TEST_001, TEST_002 and TEST_003) with 1999*3 time steps and 3 variables each to predict the outcome which is a continuation of the data set into the future from the target data set which was used for training I need to validate my model by predicting the output for another set of inputs (TEST_000, TEST_001, TEST_002 and TEST_003)