For everybody here just in case: for now you must provide your ID and not your username. It is visible when you hover your name on the top of the osu! website (the link is http://osu.ppy.sh/u/XXXXXX, "XXXXXX" being your ID).
um, the "Dynamic Signature" is well, but i think you should change the fonts of pp, score, acc and P.C. fonts because I don't feel very beautiful fonts now ... (Recommend only, and my english is poor, sorry about that.)