Filipe-Moleiro:
I tried to connect the 3 servos, they are working weirdly, they try to move, but they dont, they just tremble.
That is very often insufficient power. How exactly are the servos connected (all 3 wires) and what is powering them? If they are connected via a breadboard that may be the problem, breadboards can't handle the relatively high currents that servos need.
Steve