Testing a neural network after training it

hi i have a 2 class problem and im using vgg16 as a convnet to classify

im using deep network designer app and after training it i dont have an option to test it

i have 1000 pics for each class and about 230 as a test

i need to test with these pics and give the results

after i train it i have results and layer in my workshop which i save them

but i have no way to test it

also when i export the network after training and then run it, it just keeps retraining it

does it test it and i dont get it? or im doing something wrong