Milton,
parameters# of simulations must be greater 1
this is because you did not set criteria for inputs.
If you want to optimize e.g. a moving average, usually you will be optimizing its length. Let's assume the default lenght is 14 then you need to test other lenghts, e.g. from 10 to 30 with step 1.
So in the "Search properties" window you need to set start value, end value and step settings to start optimization.
Note that you need move between cells with mouse (do not click Enter), then click OK.