Methods for allowing a user to control a neuromodulator to modify a cognitive state being experienced by the user. The user may select a waveform ensemble from a hand-held user device having an interface, and the user may adjust the perceived intensity of the applied waveform ensemble with the user device while the waveform ensemble is being applied. Also described are methods of managing communication between the hand-held user device (such as a smartphone or the like) and a wearable neurostimulator. Methods of displaying and visually tracking and controlling the applied waveform ensemble are also described herein.