Im a little confused

As tittle says, im not so sure about, if you just can donate once, and then dont have to do it anymore? Because i was thinking of it, since i wanna try help the clan, but i dont have that many money either, since i am gonna spend it on some better PC equipment soon. As said it was only something i thought about, but i just wanted to hear, if it was possible just to do it once.

yes you can donate just once (: you dont have to do it period but any size donations are welcome