First of all, i am sorry that i dont speak nl

But my problem is that i bought this tail light:
http://www.gearparts24.de/ruecklicht-str8:a4253.html" onclick="window.open(this.href);return false;
And the turn signals are flashing too fast, so i want to put on some resistors, but which resistors should i put on? And how powerful?
My bike is the Aprilia SX 50 year 2011.