To do a simulation of device user needs to navigate a filter combination where is his device of interest, in this case device is "actuator" that gets displayed with filter navigation Enabler -> City , Context -> IoT devices and Category -> Environment, Issues, Waste. Now user should click on device details, in this case device details on "actuator"
With device details being displayed user needs to click on "start"(play) button of particular device attribute, in order to start the standard simulation with default values of that attribute.
If simulation started user should see a change in icon button, so now it should be displayed a button for stopping simulation.
Also if device has multiple attributes, user can click on a button to start simulation for all of the attributes of this device, as shown in following picture