check the category in which given data belonging to.

I have trained the given into 4 different category using artificial neural network tool. now I have to check the new data with trained set and display the category of the data belonging to.please someone help me to solve the problem. I tried but I am getting error, when I compare the new with trained set. thank you

[Adam]

You haven't shown any code or any error messages, so what type of help are you expecting? Show what you did and what error you got and you are far more likely to get help.