Your english is plenty good
Anyway, using wav files wouldn't make any sense with Operator, since Operator is only a synthesizer - it's designed to produce sounds from scratch. It takes MIDI as input and produces audio as output. The presets are just prearranged positions for all the knobs and settings in a copy of Operator. You don't have to be restricted to them though, you can move the knobs however you want.
Now, you might be thinking of loading a wav file up in a device that plays back that wav file and modifies it in interesting ways. In that case, you're doing it right, but you just have the wrong instrument! You need a sampler. Live comes with one called Simpler, and there's a larger one with more features called Sampler which you can buy as an add-on.
Hope this helps!