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If you're using the test library dot probe and your issue is what I think it is, you're probably having trouble because the test library code is set up for letter and number keys only. From a quick look, if you want to use arrow keys as a response, you could add extra parameters:
/ responsekey_left_name = "Left arrow"
/ responsekey_right_name = "Right arrow"
/responsekey_left = 203
/responsekey_right = 205
The test library should read the key codes correctly in the task, but for the instructions to work, you will need to replace references to parameters.responsekey_left and parameters.responsekey_right with parameters.responsekey_left_name and parameters.responsekey_right_name respectively when they appear in the instructions.
Hope this helps!